HDFS-16435. Remove no need TODO comment for ObserverReadProxyProvider (#3912). Contributed by tomscut.

Reviewed-by: Chao Sun <sunchao@apache.org>
Signed-off-by: Ayush Saxena <ayushsaxena@apache.org>

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/ObserverReadProxyProvider.java

@@ -214,7 +214,6 @@ public class ObserverReadProxyProvider<T>
         OBSERVER_PROBE_RETRY_PERIOD_KEY,
         OBSERVER_PROBE_RETRY_PERIOD_DEFAULT, TimeUnit.MILLISECONDS);
 
-    // TODO : make this configurable or remove this variable
     if (wrappedProxy instanceof ClientProtocol) {
       this.observerReadEnabled = true;
     } else {