Style: Misc docs and comment style and language fixes

- Removed empty paragraphs in XML.
- Consistently use bold style for "Example:", on a new line.
- Fix usage of `[code]` when hyperlinks could be used (`[member]`, `[constant]`).
- Fix invalid usage of backticks for inline code in BBCode.
- Fix some American/British English spelling inconsistencies.
- Other minor fixes spotted along the way, including typo fixes with codespell.
- Don't specify `@GlobalScope` for `enum` and `constant`.

doc/classes/Input.xml

@@ -254,7 +254,7 @@
 			<param index="0" name="event" type="InputEvent" />
 			<description>
 				Feeds an [InputEvent] to the game. Can be used to artificially trigger input events from code. Also generates [method Node._input] calls.
-				Example:
+				[b]Example:[/b]
 				[codeblocks]
 				[gdscript]
 				var cancel_event = InputEventAction.new()
@@ -366,7 +366,7 @@
 			<param index="0" name="position" type="Vector2" />
 			<description>
 				Sets the mouse position to the specified vector, provided in pixels and relative to an origin at the upper left corner of the currently focused Window Manager game window.
-				Mouse position is clipped to the limits of the screen resolution, or to the limits of the game window if [enum MouseMode] is set to [code]MOUSE_MODE_CONFINED[/code] or [code]MOUSE_MODE_CONFINED_HIDDEN[/code].
+				Mouse position is clipped to the limits of the screen resolution, or to the limits of the game window if [enum MouseMode] is set to [constant MOUSE_MODE_CONFINED] or [constant MOUSE_MODE_CONFINED_HIDDEN].
 			</description>
 		</method>
 	</methods>