HDFS-14491. More Clarity on Namenode UI Around Blocks and Replicas. Contributed by Siyao Meng.

(cherry picked from commit 6a43d0fbd49b3ff1ce75a2334b51a98ae476e473)

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/dfshealth.html

@@ -183,7 +183,7 @@
   <tr><th><a href="#tab-datanode-volume-failures">Total Datanode Volume Failures</a></th><td>{VolumeFailuresTotal} ({EstimatedCapacityLostTotal|fmt_bytes})</td></tr>
   {@eq key=nnstat.State value="active"}
     <tr><th title="Excludes missing blocks.">Number of Under-Replicated Blocks</th><td>{UnderReplicatedBlocks}</td></tr>
-    <tr><th>Number of Blocks Pending Deletion</th><td>{PendingDeletionBlocks}</td></tr>
+    <tr><th>Number of Blocks Pending Deletion (including replicas)</th><td>{PendingDeletionBlocks}</td></tr>
   {/eq}
   <tr><th>Block Deletion Start Time</th><td>{BlockDeletionStartTime|date_tostring}</td></tr>
 {/fs}