rpk: unexpected use of --format flag. (#1351)

Author: r-vasquez

modules/reference/pages/rpk/rpk-redpanda/rpk-redpanda-config-set.adoc

@@ -55,13 +55,6 @@ the end of an array to extend it:
 rpk redpanda config set redpanda.advertised_kafka_api[1] '{address: 10.0.0.1, port: 9092}'
 ----
 
-The json format can be used to set values as json:
-
-[,bash]
-----
-rpk redpanda config set redpanda.rpc_server '{"address":"0.0.0.0","port":33145}' --format json
-----
-
 You may also use `<key>=<value>` notation for setting configuration properties:
 
 [,bash]