Fix typo

Author: Yasuo Ohgaki

NEWS

@@ -6,7 +6,7 @@ PHP                                                                        NEWS
   . Fix integer overflows (Joshua Rogers)
 
 - Core:
-  . Removed IS_TYPE_IMMUTABLE (it's the same as COPYABLE & !REFCOUED). (Dmitry)
+  . Removed IS_TYPE_IMMUTABLE (it's the same as COPYABLE & !REFCOUNTED). (Dmitry)
   . Removed the sql.safe_mode directive. (Kalle)
   . Removed support for Netware. (Kalle)
   . Fixed bug #54535 (WSA cleanup executes before MSHUTDOWN). (Kalle)