"Marker" pages for two new features

Author: jaceklaskowski

docs/arbitrary-state-api-v2.md

@@ -0,0 +1,5 @@
+# Arbitrary State API v2
+
+**Arbitrary State API v2** for more flexible state management.
+
+Arbitrary State API v2 was introduced in [Apache Spark 4.0.0]({{ spark.jira }}/SPARK-46815).

docs/datasources/state/index.md

@@ -0,0 +1,5 @@
+# State Data Source
+
+**State Data Source** allows for easier debugging.
+
+State Data Source was introduced in [Apache Spark 4.0.0]({{ spark.jira }}/SPARK-45511).

mkdocs.yml

@@ -231,6 +231,7 @@ nav:
       - StreamingQueryWrapper: StreamingQueryWrapper.md
   - Features:
     - features/index.md
+    - Arbitrary State API v2: arbitrary-state-api-v2.md
     - Data Sources: datasources/index.md
     - Micro-Batch Execution:
       - micro-batch-execution/index.md
@@ -428,6 +429,8 @@ nav:
       - RatePerMicroBatchProvider: datasources/rate-micro-batch/RatePerMicroBatchProvider.md
       - RatePerMicroBatchStream: datasources/rate-micro-batch/RatePerMicroBatchStream.md
       - RatePerMicroBatchTable: datasources/rate-micro-batch/RatePerMicroBatchTable.md
+    - State:
+      - datasources/state/index.md
     - Text Socket:
       - datasources/socket/index.md
       - TextSocketSourceProvider: datasources/socket/TextSocketSourceProvider.md