🚧 💡 add comments for message etc. in mirai adapter

nonebot/adapters/mirai/config.py

@@ -5,6 +5,15 @@ from pydantic import BaseModel, Extra, Field
 
 
 class Config(BaseModel):
+    """
+    Mirai 配置类
+
+    :必填:
+
+      - ``mirai_auth_key``: mirai-api-http的auth_key
+      - ``mirai_host``: mirai-api-http的地址
+      - ``mirai_port``: mirai-api-http的端口
+    """
     auth_key: Optional[str] = Field(None, alias='mirai_auth_key')
     host: Optional[IPv4Address] = Field(None, alias='mirai_host')
     port: Optional[int] = Field(None, alias='mirai_port')