update docs

docs/sanic/request_data.md

@@ -17,7 +17,7 @@ The following variables are accessible as properties on `Request` objects:
 
 - `args` (dict) - Query string variables. A query string is the section of a
   URL that resembles `?key1=value1&key2=value2`. If that URL were to be parsed,
-  the `args` dictionary would look like `{'key1': 'value1', 'key2': 'value2'}`.
+  the `args` dictionary would look like `{'key1': ['value1'], 'key2': ['value2']}`.
   The request's `query_string` variable holds the unparsed string value.
 
   ```python
@@ -28,6 +28,10 @@ The following variables are accessible as properties on `Request` objects:
       return json({ "parsed": True, "args": request.args, "url": request.url, "query_string": request.query_string })
   ```
 
+- `raw_args` (dict) - On many cases you would need to access the url arguments in
+  a less packed dictionary. For same previous URL `?key1=value1&key2=value2`, the
+  `raw_args` dictionary would look like `{'key1': 'value1', 'key2': 'value2'}`.
+
 - `files` (dictionary of `File` objects) - List of files that have a name, body, and type
 
   ```python