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.

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