[docs/configuration.md] remove github_app_installation_id
@@ -185,7 +185,6 @@ The acceptable names are the same as for the package config:
`github_token` | string | Github API token: this is needed when packit interacts with Github API
`pagure_user_token` | string | Pagure token needed to access REST API, get it at: https://src.fedoraproject.org/settings#nav-api-tab
`pagure_fork_token` | string | a token so packit can create a pull request: https://src.fedoraproject.org/fork/YOU/rpms/PACKAGE/settings#apikeys-tab
- `github_app_installation_id` | string | if authenticating with a github app, this is the installation ID
`github_app_id` | string | github app ID used for authentication
`github_app_cert_path` | string | path to a certificate associated with a github app
