fix(spec): protocol-17 rationale 改述 area 项级门禁的现状 —— #4722 已关闭「服务端不走 areas」那条 caveat (#5337)

fix(spec): protocol-17 rationale 改述 area 项级门禁的现状 —— #4722 已关闭「服务端不走 areas」那条 caveat (#5337) #13880