Apply suggestions from code review

Co-authored-by: Jessica He <[email protected]>

Author: themr0c

modules/integrating-with-github/proc-enabling-github-repository-discovery.adoc

@@ -78,8 +78,6 @@ Enter your GitHub organization name, such as `__<your_github_organization_name>_
 Enter the saved **Private key**.
 `INTEGRATION_GITHUB_WEBHOOK_SECRET`::
 Enter the saved *Webhook secret*.
-`INTEGRATION_GITHUB_WEBHOOK_URL`::
-Enter your {product-short} URL: `pass:c,a,q[{my-product-url}]`.
 
 . Enable the `plugin-catalog-backend-module-github` plugin in your `dynamic-plugins.yaml` file.
 +
@@ -119,7 +117,6 @@ integrations:
         - appId: ${INTEGRATION_GITHUB_APP_ID}
           clientId: ${INTEGRATION_GITHUB_CLIENT_ID}
           clientSecret: ${INTEGRATION_GITHUB_CLIENT_SECRET}
-          webhookUrl: ${INTEGRATION_GITHUB_WEBHOOK_URL}
           webhookSecret: ${INTEGRATION_GITHUB_WEBHOOK_SECRET}
           privateKey: |
             ${INTEGRATION_GITHUB_PRIVATE_KEY_FILE}