docs: fix broken heading anchors (#2237)

Five internal links pointed at anchors that do not exist. Three dropped
the dash a slash produces in the slug (key-column-names-with-spaces,
floats-decimals, text-strings) and two targeted headings that were since
renamed (variables-are-immutable-by-default, setting-the-editing-mode).

Author: wahidrizka

book/coming_from_bash.md

@@ -97,7 +97,7 @@ $env.Path = ($env.Path | prepend 'C:\Program Files\Git\usr\bin')
 | (Emacs Mode) <kbd>Ctrl</kbd>+<kbd>X</kbd><kbd>Ctrl</kbd>+<kbd>E</kbd> | <kbd>Ctrl/Cmd</kbd>+<kbd>O</kbd> | Edit the command-line in the editor defined by `$env.EDITOR`   |
 | (Vi Command Mode) <kbd>V</kbd>       | <kbd>Ctrl/Cmd</kbd>+<kbd>O</kbd>                              | Edit the command-line in the editor defined by `$env.EDITOR`       |
 
-Most common Emacs-mode and Vi-mode keybindings are also available. See the [Reedline Chapter](line_editor.html#editing-mode).
+Most common Emacs-mode and Vi-mode keybindings are also available. See the [Reedline Chapter](line_editor.html#setting-the-editing-mode).
 
 ::: tip
 In Bash, history substitution occurs immediately after pressing <kbd>Enter</kbd> 

book/control_flow.md

@@ -162,7 +162,7 @@ While it may be tempting to use loops if you're familiar with them in other lang
 
 The biggest downside of loops is that they are statements, unlike [`each`](/commands/docs/each.html) which is an expression. Expressions, like [`each`](/commands/docs/each.html) always result in some output value, however statements do not.
 
-This means that they don't work well with immutable variables and using immutable variables is considered a more [Nushell-style](/book/thinking_in_nu.html#variables-are-immutable). Without a mutable variable declared beforehand in the example in the previous section, it would be impossible to use [`for`](/commands/docs/each.html) to get the list of numbers with incremented numbers, or any value at all.
+This means that they don't work well with immutable variables and using immutable variables is considered a more [Nushell-style](/book/thinking_in_nu.html#variables-are-immutable-by-default). Without a mutable variable declared beforehand in the example in the previous section, it would be impossible to use [`for`](/commands/docs/each.html) to get the list of numbers with incremented numbers, or any value at all.
 
 Statements also don't work in Nushell pipelines which require some output. In fact Nushell will give an error if you try:
 

book/navigating_structured_data.md

@@ -17,7 +17,7 @@ Given Nushell's strong support for structured data, some of the more common task
   - Example - `get` vs. `select` with a Table Row
   - Example - `select` with multiple rows and columns
 - [Handling missing data using the optional operator](#the-optional-operator)
-- [Key/Column names with spaces](#keycolumn-names-with-spaces)
+- [Key/Column names with spaces](#key-column-names-with-spaces)
 - [Other commands for navigating structured data](#other-commands-for-accessing-structured-data)
 
 ## Background

lang-guide/chapters/types/basic_types/float.md

@@ -6,7 +6,7 @@
 | **_Annotation:_**     | `float`                                                                          |
 | **_Literal syntax:_** | A decimal numeric value including a decimal place. E.g., `1.5`, `2.0`, `-15.333` |
 | **_Casts:_**          | [`into float`](/commands/docs/into_float.md)                                     |
-| **_See also:_**       | [Types of Data - Floats](/book/types_of_data.md#floatsdecimals)                  |
+| **_See also:_**       | [Types of Data - Floats](/book/types_of_data.md#floats-decimals)                  |
 
 ## Additional language notes
 

lang-guide/chapters/types/basic_types/string.md

@@ -7,7 +7,7 @@
 | **_Literal Syntax:_** | See [Working with strings](/book/working_with_strings.md)    |
 | **_Casts:_**          | [`into string`](/commands/docs/into_string.md)               |
 | **_See also:_**       | [Handling Strings](/book/loading_data.md#handling-strings)   |
-|                       | [Types of Data - String](/book/types_of_data.md#textstrings) |
+|                       | [Types of Data - String](/book/types_of_data.md#text-strings) |
 
 ## Language Notes: