docs: Add support for @inheritDoc (alias for @inheritdoc)

docs: Add support for @inheritDoc (alias for @inheritdoc)

Lots of methods are missing documentation for methods in favour
of an unhelpful description text containing "@inheritDocs", leading
to warnings in CI during the doc building stage:

> mediawiki/includes/resourceloader/ResourceLoaderLessVarFileModule.php:9:
> warning: Found unknown command '\inheritDoc'

Before:

> ◆ ResourceLoaderLessVarFileModule::getMessages	( )
> Description
>   @inheritDoc
>
> Reimplemented from ResourceLoaderFileModule.
> Definition at line 26 of file ResourceLoaderLessVarFileModule.php.

After:

> ◆ ResourceLoaderLessVarFileModule::getMessages	( )
> Description
>   Gets list of message keys used by this module.
>
> Returns
>   array List of message keys
>
> Reimplemented from ResourceLoaderFileModule.
> Definition at line 26 of file ResourceLoaderLessVarFileModule.php.

Bug: T219001
Bug: T232104
Change-Id: I7f133c10acca084239a158c63c08b71e709404c3