Docs: Consistently include an empty line between @since tag and @see, @link, or @global, per the documentation standards.

See #49572.

git-svn-id: https://develop.svn.wordpress.org/trunk@48067 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/theme.php

@@ -146,6 +146,7 @@ function _get_template_edit_filename( $fullpath, $containingfolder ) {
  * Will display link, if there is an update available.
  *
  * @since 2.7.0
+ *
  * @see get_theme_update_available()
  *
  * @param WP_Theme $theme Theme data object.