Add @static* annotations where they are missing.

Initialize all static vars that are not, most to `null`.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32650 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-theme.php

@@ -687,7 +687,7 @@ final class WP_Theme implements ArrayAccess {
      * @since 3.4.0
 	 * @access private
 	 *
-	 * @stativar string $comma
+	 * @staticvar string $comma
 	 *
 	 * @param string $header Theme header. Name, Description, Author, Version, ThemeURI, AuthorURI, Status, Tags.
 	 * @param string $value Value to mark up.