Merge pull request #528 from TheZalRevolt/master

Docs - added mention to the fact that github webhook should be in json format

documentation/docs/getting-started/running-opal/run-opal-server/policy-repo-syncing.mdx

@@ -25,6 +25,8 @@ It is much more recommended to use webhooks if your policy repo is stored in a s
 
 If your server is hosted at `https://opal.yourdomain.com` the webhook URL you must setup with your webhook provider (e.g: github) is `https://opal.yourdomain.com/webhook`. See [GitHub's guide on configuring webhooks](https://docs.github.com/en/developers/webhooks-and-events/creating-webhooks).
 
+Keep in mind that the webhook should be in `JSON` format.
+
 Typically you would need to share a secret with your webhook provider (authenticating incoming webhooks). You can use the OPAL CLI to create a cryptographically strong secret to use.
 
 <a name="generate-secret"></a>Let's install the cli to a new python virtualenv:{" "}