Fix initialism errors (PR-3) (#17062)

* Fix initialism errors

* Revert some changes and regenerate file

* Update client4.go

* Update group_test.go

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/plugin_api.go

@@ -537,7 +537,7 @@ func (api *PluginAPI) GetGroupByName(name string) (*model.Group, *model.AppError
 }
 
 func (api *PluginAPI) GetGroupsForUser(userID string) ([]*model.Group, *model.AppError) {
-	return api.app.GetGroupsByUserId(userID)
+	return api.app.GetGroupsByUserID(userID)
 }
 
 func (api *PluginAPI) CreatePost(post *model.Post) (*model.Post, *model.AppError) {