Use the correct type (integer) for the `$menu_id` parameter in the `wp_get_nav_menu_to_edit()` DocBlock.

Also properly mark the parameter as optional and specify the default value.

Props jaimieolmstead for the initial patch.
Fixes #30540.

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Add missing return descriptions for a variety of functions in wp-includes/link-template.php.

Props colorful-tones, dustyf.
See #30406.

Built from https://develop.svn.wordpress.org/trunk@30628


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Check attachments as well as the current post type when checking for duplicate post slugs. This avoids creating a page with a slug which conflicts with an existing attachment (the inverse is already handled).

Updates the existing test for pages which should take priority over attachments in cases where an existing clash exists.

Fixes #18962
Props boonebgorges

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