Move YARN-3790 from 2.7.1 to 2.8 in CHANGES.txt

hadoop-yarn-project/CHANGES.txt

@@ -500,6 +500,9 @@ Release 2.8.0 - UNRELEASED
     YARN-3835. hadoop-yarn-server-resourcemanager test package bundles
     core-site.xml, yarn-site.xml (vamsee via rkanter)
 
+    YARN-3790. usedResource from rootQueue metrics may get stale data for FS
+    scheduler after recovering the container (Zhihai Xu via rohithsharmaks)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES
@@ -661,9 +664,6 @@ Release 2.7.1 - UNRELEASED
     YARN-3832. Resource Localization fails on a cluster due to existing cache
     directories (Brahma Reddy Battula via jlowe)
 
-    YARN-3790. usedResource from rootQueue metrics may get stale data for FS
-    scheduler after recovering the container (Zhihai Xu via rohithsharmaks)
-
 Release 2.7.0 - 2015-04-20
 
   INCOMPATIBLE CHANGES