Cleanup incorrect duplicate comments for hooks in wp-admin/edit-tag-form.php introduced in [26274].

Also corrects the @since version for {$taxonomy}_term_new_form_tag in wp-admin/edit-tags.php.

Props kpdesign. See #25532.


git-svn-id: https://develop.svn.wordpress.org/trunk@26339 602fd350-edb4-49c9-b593-d223f7449a82