Fix up author name to Jun Gong in CHANGES.txt for YARN-3469

(cherry picked from commit 5cda6fffd39fcb997b6e3cbcd0a2e2dce07153e1)

hadoop-yarn-project/CHANGES.txt

@@ -17,7 +17,7 @@ Release 2.7.1 - UNRELEASED
     auto-failover enabled. (Akira AJISAKA via wangda)
 
     YARN-3469. ZKRMStateStore: Avoid setting watches that are not required. 
-    (Jun Hong via kasha)
+    (Jun Gong via kasha)
 
   BUG FIXES