fix typo

Author: smalyshev

NEWS

@@ -27,7 +27,7 @@ PHP                                                                        NEWS
     some specific contents). (Stas)
 
 - Pgsql:
-  . Fixed bug #65336 (pg_escape_literal/identifier() scilently returns false).
+  . Fixed bug #65336 (pg_escape_literal/identifier() silently returns false).
     (Yasuo)
 
 ?? ??? 2013, PHP 5.4.18