docs(mnq): modifs to mnq doc for new developers site (#3057)

Co-authored-by: Rémy Léone <rleone@scaleway.com>

Author: scaleway-bot

cmd/scw/testdata/test-all-usage-mnq-usage.golden

@@ -1,6 +1,6 @@
 🎲🎲🎲 EXIT CODE: 0 🎲🎲🎲
 🟥🟥🟥 STDERR️️ 🟥🟥🟥️
-MnQ API (beta).
+Messaging and Queuing API.
 
 USAGE:
   scw mnq <command>

docs/commands/mnq.md

@@ -1,6 +1,6 @@
 <!-- DO NOT EDIT: this file is automatically generated using scw-doc-gen -->
 # Documentation for `scw mnq`
-MnQ API (beta).
+Messaging and Queuing API.
 
 - [MnQ Credentials commands](#mnq-credentials-commands)
   - [Create credentials](#create-credentials)

internal/namespaces/mnq/v1alpha1/mnq_cli.go

@@ -37,7 +37,7 @@ func GetGeneratedCommands() *core.Commands {
 func mnqRoot() *core.Command {
 	return &core.Command{
 		Short:     `This API allows you to manage Scaleway Messaging and Queueing brokers`,
-		Long:      `MnQ API (beta).`,
+		Long:      `Messaging and Queuing API.`,
 		Namespace: "mnq",
 	}
 }