chore: apply suggestions from code review

Co-authored-by: Zaiming (Stone) Shi <zmstone@gmail.com>

rel/i18n/emqx_mgmt_api_cluster.hocon

@@ -26,8 +26,8 @@ force_remove_node.label:
 """Force leave node from cluster"""
 
 get_invitation_status.desc:
-"""Get the execution status of all asynchronous invite node tasks"""
+"""Get the execution status of all asynchronous invite status per node"""
 get_invitation_status.label:
-"""Get status of all invitation tasks"""
+"""Get invitation statuses"""
 
 }