[du] full sending on type annotations (#21726)

## Summary & Motivation

## How I Tested These Changes

Author: tacastillo

docs/dagster-university/pages/dagster-essentials/extra-credit/asset-metadata-as-markdown.md

@@ -32,7 +32,7 @@ In Lesson 9, you created the `adhoc_request` asset. During materialization, the
      end_date: str
 
    @asset
-   def adhoc_request(config: AdhocRequestConfig, taxi_zones, taxi_trips, database: DuckDBResource):
+   def adhoc_request(config: AdhocRequestConfig, taxi_zones, taxi_trips, database: DuckDBResource) -> None:
        """
          The response to an request made in the `requests` directory.
          See `requests/README.md` for more information.
@@ -148,7 +148,7 @@ class AdhocRequestConfig(Config):
     end_date: str
 
 @asset
-def adhoc_request(config: AdhocRequestConfig, taxi_zones, taxi_trips, database: DuckDBResource):
+def adhoc_request(config: AdhocRequestConfig, taxi_zones, taxi_trips, database: DuckDBResource) -> None:
     """
       The response to an request made in the `requests` directory.
       See `requests/README.md` for more information.

docs/dagster-university/pages/dagster-essentials/extra-credit/coding-practice-metadata-taxi-zones-file.md

@@ -21,7 +21,7 @@ from dagster import MaterializeResult
 @asset(
     group_name="raw_files",
 )
-def taxi_zones_file():
+def taxi_zones_file() -> None:
     """
       The raw CSV file for the taxi zones dataset. Sourced from the NYC Open Data portal.
     """

docs/dagster-university/pages/dagster-essentials/extra-credit/definition-metadata-asset-descriptions.md

@@ -23,7 +23,7 @@ Docstrings are defined by including a string, surrounded by triple quotes (`”
 from dagster import asset
 
 @asset
-def taxi_zones_file():
+def taxi_zones_file() -> None:
     """
       The raw CSV file for the taxi zones dataset. Sourced from the NYC Open Data portal.
     """
@@ -49,7 +49,7 @@ from dagster import asset
 @asset(
     description="The raw CSV file for the taxi zones dataset. Sourced from the NYC Open Data portal."
 )
-def taxi_zones_file():
+def taxi_zones_file() -> None:
     """
       This will not show in the Dagster UI
     """

docs/dagster-university/pages/dagster-essentials/extra-credit/definition-metadata-asset-groups.md

@@ -56,7 +56,7 @@ from dagster import asset
 @asset(
     group_name="raw_files",
 )
-def taxi_zones_file():
+def taxi_zones_file() -> None:
     """
       The raw CSV file for the taxi zones dataset. Sourced from the NYC Open Data portal.
     """

docs/dagster-university/pages/dagster-essentials/extra-credit/materialization-metadata.md

@@ -33,7 +33,7 @@ Let’s add metadata to the `taxi_trips_file` asset to demonstrate further. This
        partitions_def=monthly_partition,
        group_name="raw_files",
    )
-   def taxi_trips_file(context):
+   def taxi_trips_file(context) -> None:
        """
          The raw parquet files for the taxi trips dataset. Sourced from the NYC Open Data portal.
        """
@@ -65,8 +65,22 @@ Let’s add metadata to the `taxi_trips_file` asset to demonstrate further. This
    )
    ```
 
+5. Then, since we're now returning something, let's update the return type of the asset to `MaterializeResult`:
+
+   ```python
+   from dagster import asset, MaterializeResult
+
+   @asset(
+       partitions_def=monthly_partition,
+       group_name="raw_files",
+   )
+   def taxi_trips_file(context) -> MaterializeResult:
+   ```
+
+
    Let’s break down what’s happening here:
 
+   - Rather than returning nothing, we'll return some information about the materialization that happened with the `MaterializationResult` class.
    - The `metadata` parameter accepts a `dict`, where the key is the label or name of the metadata and the value is the data itself. In this case, the key is `Number of records`. The value in this example is everything after `Number of records`.
    - Using `MetadataValue.int`, the value of the `num_rows` variable is typed as an integer. This tells Dagster to render the data as an integer.
 
@@ -80,7 +94,7 @@ Let’s add metadata to the `taxi_trips_file` asset to demonstrate further. This
        partitions_def=monthly_partition,
        group_name="raw_files",
    )
-   def taxi_trips_file(context):
+   def taxi_trips_file(context) -> MaterializeResult:
        """
          The raw parquet files for the taxi trips dataset. Sourced from the NYC Open Data portal.
        """

docs/dagster-university/pages/dagster-essentials/lesson-3/asset-materialization.md

@@ -12,7 +12,7 @@ To better understand how materialization works, let’s take another look at the
 
 ```python file=/dagster-university/lesson_3.py startafter=start_taxi_trips_file_asset endbefore=end_taxi_trips_file_asset
 @asset
-def taxi_trips_file():
+def taxi_trips_file() -> None:
     """The raw parquet files for the taxi trips dataset. Sourced from the NYC Open Data portal."""
     month_to_fetch = "2023-03"
     raw_trips = requests.get(

docs/dagster-university/pages/dagster-essentials/lesson-3/coding-practice-taxi-zones-file-asset.md

@@ -22,7 +22,7 @@ The asset you built should look similar to the following code. Click **View answ
 
 ```python {% obfuscated="true" %}
 @asset
-def taxi_zones_file():
+def taxi_zones_file() -> None:
     """
       The raw CSV file for the taxi zones dataset. Sourced from the NYC Open Data portal.
     """

docs/dagster-university/pages/dagster-essentials/lesson-3/defining-your-first-asset.md

@@ -19,10 +19,10 @@ Your first asset, which you’ll name `taxi_trips_file`, will retrieve the yello
    from . import constants
    ```
 
-3. Below the imports, add the following code to create a function named `taxi_trips_file`:
+3. Below the imports, let's define a function that takes no inputs and returns nothing (type-annoted with `None`). Add the following code to create a function to do this named `taxi_trips_file`:
 
    ```python
-   def taxi_trips_file():
+   def taxi_trips_file() -> None:
        """
          The raw parquet files for the taxi trips dataset. Sourced from the NYC Open Data portal.
        """
@@ -51,7 +51,7 @@ Your first asset, which you’ll name `taxi_trips_file`, will retrieve the yello
       from dagster import asset
 
       @asset
-      def taxi_trips_file():
+      def taxi_trips_file() -> None:
           """
             The raw parquet files for the taxi trips dataset. Sourced from the NYC Open Data portal.
           """
@@ -65,3 +65,5 @@ Your first asset, which you’ll name `taxi_trips_file`, will retrieve the yello
       ```
 
 That’s it - you’ve created your first Dagster asset! Using the `@asset` decorator, you can easily turn any existing Python function into a Dagster asset.
+
+**Questions about the `-> None` bit?** That's a Python feature called **type annotation**. In this case, it's saying that the function returns nothing. You can learn more about type annotations in the [Python documentation](https://docs.python.org/3/library/typing.html). We highly recommend using type annotations in your code to make it easier to read and understand.

docs/dagster-university/pages/dagster-essentials/lesson-3/troubleshooting-failed-runs.md

@@ -16,7 +16,7 @@ import requests
 from dagster import asset
 
 @asset
-def taxi_trips_file():
+def taxi_trips_file() -> None:
     """
       The raw parquet files for the taxi trips dataset. Sourced from the NYC Open Data portal.
     """

docs/dagster-university/pages/dagster-essentials/lesson-4/assets-with-in-memory-computations.md

@@ -37,7 +37,7 @@ Having all of your assets in one file becomes difficult to manage. Let’s separ
    @asset(
        deps=["taxi_trips", "taxi_zones"]
    )
-   def manhattan_stats():
+   def manhattan_stats() -> None:
    ```
 
 4. Now, let’s add the logic to calculate `manhattan_stats`. Update the `manhattan_stats` asset definition to reflect the changes below:
@@ -46,7 +46,7 @@ Having all of your assets in one file becomes difficult to manage. Let’s separ
    @asset(
        deps=["taxi_trips", "taxi_zones"]
    )
-   def manhattan_stats():
+   def manhattan_stats() -> None:
        query = """
            select
                zones.zone,
@@ -96,7 +96,7 @@ In this section, you’ll create an asset that depends on `manhattan_stats`, loa
    @asset(
        deps=["manhattan_stats"],
    )
-   def manhattan_map():
+   def manhattan_map() -> None:
        trips_by_zone = gpd.read_file(constants.MANHATTAN_STATS_FILE_PATH)
 
        fig = px.choropleth_mapbox(trips_by_zone,