update comments

Author: stiga-huang

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/shortcircuit/ShortCircuitCache.java

@@ -232,7 +232,7 @@ public void run() {
               throw new SocketException("Create domain socket failed");
             }
           }
-        }
+        } // end of while block
       } catch (IOException e) {
         LOG.warn(ShortCircuitCache.this + ": failed to release "
             + "short-circuit shared memory slot " + slot + " by sending "
@@ -248,7 +248,7 @@ public void run() {
           pathToDomainSocket.remove(path);
         }
       }
-    }
+    } // end of run()
   }
 
   public interface ShortCircuitReplicaCreator {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java

@@ -958,7 +958,7 @@ public void testDomainSocketClosedByDN() throws Exception {
     }
   }
 
-  // Regression test for HDFS-16473
+  // Regression test for HDFS-16535
   @Test(timeout = 60000)
   public void testDomainSocketClosedByMultipleDNs() throws Exception {
     TemporarySocketDirectory sockDir = new TemporarySocketDirectory();