Remove --force-message option from the review command

Since 8c850ec the review message is always added even if labels
could not be applied, making the `--force-message` option redundant.

Remove the option from the command and the documentation.

Change-Id: Id10f8f4dc77988670584dea622e6708942320780

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/ReviewCommand.java

@@ -105,10 +105,6 @@ public class ReviewCommand extends SshCommand {
   @Option(name = "--submit", aliases = "-s", usage = "submit the specified patch set(s)")
   private boolean submitChange;
 
-  @Option(name = "--force-message", usage = "publish the message, "
-      + "even if the label score cannot be applied due to the change being closed")
-  private boolean forceMessage = false;
-
   @Option(name = "--publish", usage = "publish the specified draft patch set(s)")
   private boolean publishPatchSet;