Squash dialyzer warning

Author: acogoluegnes

deps/rabbitmq_stream/src/Elixir.RabbitMQ.CLI.Ctl.Commands.ActivateStreamConsumerCommand.erl

@@ -68,7 +68,8 @@ usage() ->
       "--reference <reference> [--vhost <vhost>]">>.
 
 usage_additional() ->
-    "debugging command, use only when a group does not have an active consumer".
+    <<"debugging command, use only when a group does not have "
+      "an active consumer">>.
 
 usage_doc_guides() ->
     [?STREAMS_GUIDE_URL].