vale: prune accepted vocabulary

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

docs/auth/add-auth-provider.md

@@ -230,7 +230,7 @@ name.
 ### Test the new provider
 
 You can `curl -i localhost:7007/api/auth/providerA/start` and which should
-provide a `302` redirect with a `Location` header. Paste the url from that
+provide a `302` redirect with a `Location` header. Paste the URL from that
 header into a web browser and you should be able to trigger the authorization
 flow.
 

docs/auth/github/provider.md

@@ -50,7 +50,7 @@ The GitHub provider is a structure with three configuration keys:
 - `clientSecret`: The client secret tied to the generated client ID.
 - `enterpriseInstanceUrl` (optional): The base URL for a GitHub Enterprise
   instance, e.g. `https://ghe.<company>.com`. Only needed for GitHub Enterprise.
-- `callbackUrl` (optional): The callback url that GitHub will use when
+- `callbackUrl` (optional): The callback URL that GitHub will use when
   initiating an OAuth flow, e.g.
   `https://your-intermediate-service.com/handler`. Only needed if Backstage is
   not the immediate receiver (e.g. one OAuth app for many backstage instances).