Add reminder to version the Press This bookmarklet link in case breaking changes are made in the future. fixes #20071.

git-svn-id: https://develop.svn.wordpress.org/trunk@19949 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/link-template.php

@@ -1792,7 +1792,7 @@ function paginate_comments_links($args = array()) {
 }
 
 /**
- * Retrieve shortcut link.
+ * Retrieve the Press This bookmarklet link.
  *
  * Use this in 'a' element 'href' attribute.
  *
@@ -1801,6 +1801,7 @@ function paginate_comments_links($args = array()) {
  * @return string
  */
 function get_shortcut_link() {
+	// In case of breaking changes, version this. #WP20071
 	$link = "javascript:
 			var d=document,
 			w=window,