HADOOP-12688. Fix deadlinks in Compatibility.md. Contributed by Gabor Liptak.

(cherry picked from commit 4cbefafcac4e7b20a23b7b416af1a2efe71e1080)
(cherry picked from commit 0d8ad99e0d551d4426201b1290cfa1da8e7b2ab2)

hadoop-common-project/hadoop-common/src/site/markdown/Compatibility.md

@@ -125,8 +125,8 @@ REST API compatibility corresponds to both the request (URLs) and responses to e
 * [WebHDFS](../hadoop-hdfs/WebHDFS.html) - Stable
 * [ResourceManager](../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html)
 * [NodeManager](../../hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html)
-* [MR Application Master](../../hadoop-yarn/hadoop-yarn-site/MapredAppMasterRest.html)
-* [History Server](../../hadoop-yarn/hadoop-yarn-site/HistoryServerRest.html)
+* [MR Application Master](../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredAppMasterRest.html)
+* [History Server](../../hadoop-mapreduce-client/hadoop-mapreduce-client-hs/HistoryServerRest.html)
 * [Timeline Server v1 REST API](../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html)
 
 #### Policy