[ci skip] Fix NEWS format

cmb69 · cmb69 · commit a8497cb8fea5 · 2022-06-17T19:34:48.000+02:00
diff --git a/NEWS b/NEWS
@@ -19,7 +19,7 @@ PHP                                                                        NEWS
   . Fixed bug #78139 (timezone_open accepts invalid timezone string argument).
     (Derick)
 
-GD:
+- GD:
   . Fixed imagecreatefromavif() memory leak. (cmb)
 
 - MBString:
