Fix entry command table entry for OBJECT for HELP option.

After #4472 the command may have just 2 arguments.

src/server.c

@@ -276,7 +276,7 @@ struct redisCommand redisCommandTable[] = {
     {"readonly",readonlyCommand,1,"F",0,NULL,0,0,0,0,0},
     {"readwrite",readwriteCommand,1,"F",0,NULL,0,0,0,0,0},
     {"dump",dumpCommand,2,"r",0,NULL,1,1,1,0,0},
-    {"object",objectCommand,3,"r",0,NULL,2,2,2,0,0},
+    {"object",objectCommand,-2,"r",0,NULL,2,2,2,0,0},
     {"memory",memoryCommand,-2,"r",0,NULL,0,0,0,0,0},
     {"client",clientCommand,-2,"as",0,NULL,0,0,0,0,0},
     {"eval",evalCommand,-3,"s",0,evalGetKeys,0,0,0,0,0},