* Update api document in admin/announcements
* Update api document in announcements
* Update api document in i/read-announcements
* Update api document in username/available
* Update api document & Fix typo in API 403 error
* Update api document
* Update api document
* Update api document
* Fix API permission definition
* Update api document
* Update api document
* Update api document
* Update api document
* Update api document
* Update api document
* Update api document
* Update api document
* Fix bug in users (api)
* Apply reviews #6757
* Apply reviews #6757
Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
