Improve various `@param` docs.

See #30224.

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TinyMCE: update to 4.1.7, changelog: https://github.com/tinymce/tinymce/blob/master/changelog.txt. Fixes #30560.
Built from https://develop.svn.wordpress.org/trunk@30675


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Improve various `@param` docs for `src/wp-includes/class-wp-customize*.php`.

See #30224.

Built from https://develop.svn.wordpress.org/trunk@30676


git-svn-id: http://core.svn.wordpress.org/trunk@30666 1a063a9b-81f0-0310-95a4-ce76da25c4cd
WPDB: Before fetching results, make sure we have a valid result resource to fetch them from.

Fixes #27982.

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Improve various `@param` docs for `src/wp-admin/includes/class-wp-filesystem-*.php`.

See #30224.

Built from https://develop.svn.wordpress.org/trunk@30678


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