docs: add callout on github app incompatibility (integrations#818)

loozhengyuan · web-flow · commit 8e502e82080b · 2021-06-18T17:06:51.000-04:00
diff --git a/website/docs/r/app_installation_repository.html.markdown b/website/docs/r/app_installation_repository.html.markdown
@@ -7,6 +7,8 @@ description: |-
 
 # github_app_installation_repository
 
+~> **Note**: This resource is not compatible with the GitHub App Installation authentication method.
+
 This resource manages relationships between app installations and repositories
 in your GitHub organization.
 
