Begin documentation and annotation backfill

sanic/config.py

@@ -101,11 +101,13 @@ class Config(dict):
     def update_config(self, config: Union[bytes, str, dict, Any]):
         """Update app.config.
 
-        Note:: only upper case settings are considered.
+        ..note:: only upper case settings are considered.
 
         You can upload app config by providing path to py file
         holding settings.
 
+        ..code-block::
+
             # /some/py/file
             A = 1
             B = 2
@@ -118,12 +120,16 @@ class Config(dict):
 
         You can upload app config by providing dict holding settings.
 
+        ..code-block::
+
             d = {"A": 1, "B": 2}
             config.update_config(d)
 
         You can upload app config by providing any object holding settings,
         but in such case config.__dict__ will be used as dict holding settings.
 
+        ..code-block::
+
             class C:
                 A = 1
                 B = 2