YARN-1462. Correct fix version from branch-2.7.1 to branch-2.8 in

CHANGES.txt

(cherry picked from commit 0b5cfacde638bc25cc010cd9236369237b4e51a8)

hadoop-yarn-project/CHANGES.txt

@@ -238,6 +238,9 @@ Release 2.8.0 - UNRELEASED
     YARN-3467. Expose allocatedMB, allocatedVCores, and runningContainers metrics on 
     running Applications in RM Web UI. (Anubhav Dhoot via kasha)
 
+    YARN-1462. Made RM write application tags to timeline server and exposed them
+    to users via generic history web UI and REST API. (Xuan Gong via zjshen)
+
   OPTIMIZATIONS
 
     YARN-3339. TestDockerContainerExecutor should pull a single image and not
@@ -448,9 +451,6 @@ Release 2.7.1 - UNRELEASED
     YARN-3723. Need to clearly document primaryFilter and otherInfo value type.
     (Zhijie Shen via xgong)
 
-    YARN-1462. Made RM write application tags to timeline server and exposed them
-    to users via generic history web UI and REST API. (Xuan Gong via zjshen)
-
   OPTIMIZATIONS
 
   BUG FIXES