Docs: Add descriptive text to @return tags in various function DocBlocks across admin and includes files.

[huzaifaalmesbah]

This PR adds missing descriptions to @return tags in various files within src/wp-admin/includes and src/wp-includes to ensure compliance with WordPress Coding Standards.

Trac Ticket: https://core.trac.wordpress.org/ticket/64224

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[mukeshpanchal27]

This all not blocker but nice to have. Thanks @huzaifaalmesbah for the PR!

@westonruter for you if you want to commit or have any suggestions.

[Copilot]

Pull request overview

This PR updates DocBlocks across several admin and includes files to add descriptive text to @return tags, aiming for better clarity and WordPress Coding Standards compliance.

Changes:

• Added descriptive @return text to functions in wp-includes (e.g., wp_is_mobile() and the IXR HTTP client).
• Documented return values of various core update, media, list-table, and IIS rewrite helper functions in wp-admin/includes.
• Expanded WP_Debug_Data’s internal methods with descriptive @return annotations for each debug section.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
src/wp-includes/vars.php	Documents what the bool return from wp_is_mobile() represents.
src/wp-includes/class-wp-http-ixr-client.php	Clarifies the success/failure semantics of WP_HTTP_IXR_Client::query().
src/wp-admin/includes/update.php	Adds descriptive @return text for core update–related helpers and update nags.
src/wp-admin/includes/misc.php	Documents boolean return semantics for IIS7 rewrite rule helper functions.
src/wp-admin/includes/media.php	Describes return values for legacy media upload handlers and media field helpers, and clarifies get_compat_media_markup()’s array structure.
src/wp-admin/includes/class-wp-theme-install-list-table.php	Clarifies ajax_user_can() and get_views() return values for the theme install list table.
src/wp-admin/includes/class-wp-screen.php	Adds a description to the show_screen_options() @return tag, but the new text is inaccurate relative to the method’s behavior.
src/wp-admin/includes/class-wp-media-list-table.php	Documents return values for capability checks, views, bulk actions, current action, item presence, sorting, and row actions in the media list table.
src/wp-admin/includes/class-wp-list-table.php	Adds descriptive return docs for core list-table helpers like has_items(), get_views(), pagination and column APIs.
src/wp-admin/includes/class-wp-debug-data.php	Adds detailed @return descriptions to private section-builder methods, but several descriptions are mismatched with the sections they actually build (e.g., server vs. media vs. themes).

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[westonruter]

In keeping also with Core-64238, in 7a409a2 I've had Gemini help me flesh out the return types to be more specific than just simply array.

[noruzzamans]

The nested @return type looks a bit complex; is this the preferred level of detail for Core PHPDoc?

[huzaifaalmesbah]

This uses PHPStan/Psalm-style generics, which might be more detailed.