Migrate groups.members with AJV validation

Non-breaking OpenAPI migration for `groups.members`: add AJV validation for the request and response schemas.

Author: Harxhit

.changeset/flat-stingrays-complain.md

@@ -2,5 +2,4 @@
 '@rocket.chat/rest-typings': minor
 '@rocket.chat/meteor': minor
 ---
-
-Migration of groups.memebers added ajv validation for request and response, schema changes for request.
+Non-breaking OpenAPI migration for `groups.members`: add AJV validation for the request and response schemas.