Add example query string from dev docs

Author: youmikoh

docs/oauth-workflow-example.md

@@ -1,6 +1,6 @@
 # Example OAuth workflow
 
-The Shopify Python API [validates HMAC and timing attacks](https://shopify.dev/apps/auth/oauth/getting-started#step-2-verify-the-installation-request) with the `request_token` function. Below is a basic example OAuth workflow for a FastAPI app. 
+The Shopify Python API [validates HMAC and timing attacks](https://shopify.dev/apps/auth/oauth/getting-started#step-2-verify-the-installation-request) with the `request_token` function. Below is a basic example OAuth workflow for a FastAPI app.
 
 
 ## Setup
@@ -19,7 +19,7 @@ API_KEY = "api-key"
 API_SECRET = "api-secret"
 
 shopify.Session.setup(api_key=API_KEY, secret=API_SECRET)
-``` 
+```
 
 3. Request permissions from the merchant with the `auth_url` from the `create_permission_url` function. Once the merchant acccepts, a temporary token `code` is sent to the specified `redirect_uri` of your app.
 
@@ -37,22 +37,20 @@ async def install(shop_name: str):
     new_session = shopify.Session(shop_url, VERSION)
     auth_url = new_session.create_permission_url(scopes, redirect_uri, state)
     return RedirectResponse(
-        url=auth_url, 
+        url=auth_url,
         status_code=303
     )
 ```
 
-4. To capture the `code`, set up a callback handler in your app. To exchange the temporary token for a permanent access token, supply the parameters from this request to the `request_token` function. 
+4. To capture the `code`, set up a callback handler in your app. To exchange the temporary token for a permanent access token, supply the parameters from this request to the `request_token` function. See an [example query string here](https://shopify.dev/apps/auth/oauth/getting-started#step-2-verify-the-installation-request) to be passed as the `request_params`.
 
 ```python
 @app.get("/auth/shopify/callback")
 async def auth_callback(request: Request):
     request_params = dict(request.query_params)
     shop_url = request_params.get("shop")
-    
+
     session = shopify.Session(shop_url, VERSION)
     access_token = session.request_token(request_params)
     # store access_token
 ```
-
-