Ensure the `nav_menu_meta_box_object` filter hook is only documented once.

See #26869.

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Ensure the `register` filter hook is only documented once.

See #26869.

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Ensure the `style_loader_tag` filter hook is only documented once.

See #26869.

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Ensure the `submitlink_box` action hook is only documented once.

See #26869.

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Ensure adjacency of a duplicate hook comment for a `the_category` filter call.

See #26869.

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git-svn-id: http://core.svn.wordpress.org/trunk@28041 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Ensure all duplicate calls of the `wp_create_file_in_uploads` filter are labeled as such.

See #26869.

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