Twenty Eleven: Document the twentyeleven_credits action hook.

Follow-up to [17954], [25627], [29998].

Props pmbaldha, sabernhardt.
See #63648.

git-svn-id: https://develop.svn.wordpress.org/trunk@60738 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-content/themes/twentyeleven/footer.php

@@ -25,7 +25,14 @@
 			?>
 
 			<div id="site-generator">
-				<?php do_action( 'twentyeleven_credits' ); ?>
+				<?php
+				/**
+				 * Fires before the Twenty Eleven footer text for footer customization.
+				 *
+				 * @since Twenty Eleven 1.0
+				 */
+				do_action( 'twentyeleven_credits' );
+				?>
 				<?php
 				if ( function_exists( 'the_privacy_policy_link' ) ) {
 					the_privacy_policy_link( '', '<span role="separator" aria-hidden="true"></span>' );