Code Modernization: Rename parameters that use reserved keywords in `wp-includes/atomlib.php`.

While using reserved PHP keywords as parameter name labels is allowed, in the context of function calls using named parameters in PHP 8.0+, this will easily lead to confusion. To avoid that, it is recommended not to use reserved keywords as function parameter names.

This commit renames the `$string` parameter to `$content` in `AtomParser::xml_escape()`.

Follow-up to [52946], [52996], [52997], [52998], [53003], [53014], [53029], [53039], [53116], [53117], [53137], [53174], [53184], [53185], [53192], [53193], [53198], [53203], [53207], [53215], [53216], [53220], [53230], [53232], [53236].

Props jrf, aristath, poena, justinahinon, SergeyBiryukov.
See #55327.
Built from https://develop.svn.wordpress.org/trunk@53239


git-svn-id: http://core.svn.wordpress.org/trunk@52828 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/atomlib.php

@@ -388,10 +388,10 @@ class AtomParser {
         return false;
     }
 
-    function xml_escape($string)
+    function xml_escape($content)
     {
              return str_replace(array('&','"',"'",'<','>'),
                 array('&amp;','&quot;','&apos;','&lt;','&gt;'),
-                $string );
+                $content );
     }
 }

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-beta2-53238';
+$wp_version = '6.0-beta2-53239';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.