Update configuring-playbook-nginx.md

fix doc highlighting oidc callback path

docs/configuring-playbook-nginx.md

@@ -46,7 +46,7 @@ For more information about these variables, check the `roles/matrix-nginx-proxy/
 
 ## Synapse + OpenID Connect for Single-Sign-On
 
-If you want to use OpenID Connect as an SSO provider (as per the [Synapse OpenID docs](https://github.com/matrix-org/synapse/blob/develop/docs/openid.md)), you need to use the following configuration (in your `vars.yml` file) to instruct nginx to forward `/_synapse/oidc` to Synapse:
+If you want to use OpenID Connect as an SSO provider (as per the [Synapse OpenID docs](https://github.com/matrix-org/synapse/blob/develop/docs/openid.md)), you need to use the following configuration (in your `vars.yml` file) to instruct nginx to forward `/_synapse/client/oidc` to Synapse:
 
 ```yaml
 matrix_nginx_proxy_proxy_matrix_client_api_forwarded_location_synapse_oidc_api_enabled: true