Moved NEWS entry for bug #69864 to proper category

Author: cmb69

NEWS

@@ -3,7 +3,6 @@
 ?? ??? 2015, PHP 5.5.27
 
 - Core:
-  . Fixed bug #69864 (Segfault in preg_replace_callback) (cmb, ab)
   . Fixed bug #69703 (Use __builtin_clzl on PowerPC).
     (dja at axtens dot net, Kalle)
   . Fixed bug #69732 (can induce segmentation fault with basic php code).
@@ -21,6 +20,9 @@
 
 - GD:
   . Fixed bug #61221 (imagegammacorrect function loses alpha channel). (cmb)
+  
+- PCRE:
+  . Fixed bug #69864 (Segfault in preg_replace_callback) (cmb, ab)
 
 - PDO_pgsql:
   . Fixed bug #69752 (PDOStatement::execute() leaks memory with DML