YARN-3623-Addendum: Improve the description for Timeline Service Version configuration in yarn-default.xml

Author: xgong

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

@@ -1769,7 +1769,7 @@
     <description>Indicate what is the current version of the running
     timeline service. For example, if "yarn.timeline-service.version" is 1.5,
     and "yarn.timeline-service.enabled" is true, it means the cluster will and
-    should bring up the timeline service v.1.5 (and nothing else).
+    should bring up the timeline service v.1.5.
     On the client side, if the client uses the same version of timeline service,
     it should succeed. If the client chooses to use a smaller version in spite of this,
     then depending on how robust the compatibility story is between versions,