4.1 Docs Audit: Improve inline documentation for various `WP_Meta_Query` methods introduced or modified in 4.1.

See #30469.

Built from https://develop.svn.wordpress.org/trunk@30617


git-svn-id: http://core.svn.wordpress.org/trunk@30607 1a063a9b-81f0-0310-95a4-ce76da25c4cd
4.1 Docs Audit: Spell out HTML element names in DocBlock summaries for the `nav_menu_css_class`, `nav_menu_item_id`, and `nav_menu_link_attributes` filters.

Due to a recent clarification in the core inline documentation standards, HTML tags are no longer allowed in DocBlock summaries as they wreak havoc on displaying pages in the official Code Reference. See #30473.

See #30469.

Built from https://develop.svn.wordpress.org/trunk@30618


git-svn-id: http://core.svn.wordpress.org/trunk@30608 1a063a9b-81f0-0310-95a4-ce76da25c4cd