[ci skip] Add missing notes regarding gc_status()

Author: cmb69

NEWS

@@ -215,6 +215,7 @@ PHP                                                                        NEWS
   . Removed support for BeOS. (Kalle)
   . Add PHP_VERSION to phpinfo() <title/>. (github/MattJeevas)
   . Add net_get_interfaces(). (Sara, Joe, Anatol)
+  . Added gc_status(). (Benjamin Eberlei)
   . Implemented flexible heredoc and nowdoc syntax, per
     RFC https://wiki.php.net/rfc/flexible_heredoc_nowdoc_syntaxes.
     (Thomas Punt)

UPGRADING

@@ -399,6 +399,8 @@ Core:
     platform, the function returns false.
   . Added net_get_interfaces() to retrieve an array of available network
     interfaces including several details.
+  . Added the gc_status() function to retrieve status information regarding the
+    cyclic GC.
 
 Date:
   . Added the DateTime::createFromImmutable() method, which mirrors