HADOOP-18563. Misleading AWS SDK S3 timeout configuration comment (#5197)

Contributed by Oleksandr Shevchenko

hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Constants.java

@@ -251,12 +251,12 @@ public final class Constants {
   public static final boolean EXPERIMENTAL_AWS_INTERNAL_THROTTLING_DEFAULT =
       true;
 
-  // seconds until we give up trying to establish a connection to s3
+  // milliseconds until we give up trying to establish a connection to s3
   public static final String ESTABLISH_TIMEOUT =
       "fs.s3a.connection.establish.timeout";
   public static final int DEFAULT_ESTABLISH_TIMEOUT = 50000;
 
-  // seconds until we give up on a connection to s3
+  // milliseconds until we give up on a connection to s3
   public static final String SOCKET_TIMEOUT = "fs.s3a.connection.timeout";
   public static final int DEFAULT_SOCKET_TIMEOUT = 200000;