[MM-37772] Idiomatic naming (URL, URI, API) (#18128)

* s/Url/URL/g & s/Uri/URI/g

* s/Api/API/g

api4/group_local.go

@@ -4,6 +4,6 @@
 package api4
 
 func (api *API) InitGroupLocal() {
-	api.BaseRoutes.Channels.Handle("/{channel_id:[A-Za-z0-9]+}/groups", api.ApiLocal(getGroupsByChannel)).Methods("GET")
-	api.BaseRoutes.Teams.Handle("/{team_id:[A-Za-z0-9]+}/groups", api.ApiLocal(getGroupsByTeam)).Methods("GET")
+	api.BaseRoutes.Channels.Handle("/{channel_id:[A-Za-z0-9]+}/groups", api.APILocal(getGroupsByChannel)).Methods("GET")
+	api.BaseRoutes.Teams.Handle("/{team_id:[A-Za-z0-9]+}/groups", api.APILocal(getGroupsByTeam)).Methods("GET")
 }