Added some info about OIDC

README.md

@@ -261,7 +261,7 @@ Opengist can be configured to use OAuth to authenticate users, with GitHub, Gite
   ```yaml
   oidc.client-key: <key>
   oidc.secret: <secret>
-  # Discovery endpoint of the OpenID provider
+  # Discovery endpoint of the OpenID provider. Generally something like http://auth.example.com/.well-known/openid-configuration
   oidc.discovery-url: http://auth.example.com/.well-known/openid-configuration
   ```
 </details>

config.yml

@@ -66,5 +66,5 @@ gitea.url: https://gitea.com/
 # To create a new OAuth2 application using OpenID Connect:
 oidc.client-key:
 oidc.secret:
-# Discovery endpoint of the OpenID provider
+# Discovery endpoint of the OpenID provider. Generally something like http://auth.example.com/.well-known/openid-configuration
 oidc.discovery-url: