procedures: Setting Authorization callback URL in GitHub OAuth app to Che OAuth callback URL

modules/administration-guide/partials/proc_configuring-github-oauth.adoc

@@ -16,6 +16,8 @@ OAuth for GitHub allows for automatic SSH key upload to GitHub.
 
 * Create a link:https://developer.github.com/apps/building-oauth-apps/creating-an-oauth-app[OAuth application in GitHub] using {prod-short} URL as the value for the application `Homepage URL` and {identity-provider} GitHub endpoint URL as the value for Authorization callback URL. The default values are `++https://++{prod-deployment}-{prod-namespace}.__<DOMAIN>__/` and `++https://++keycloak-{prod-namespace}.__<DOMAIN>__/auth/realms/{prod-deployment}/broker/github/endpoint` respectively, where `__<DOMAIN>__` is {orch-name} cluster domain.
 
+* When {prod-short} is deployed using native authentication, the value for `Authorization callback URL` should be {prod-short} OAuth callback URL. The default value is `++https://++{prod-deployment}-{prod-namespace}.__<DOMAIN>__/api/oauth/callback`.
+
 . Create a new secret in the {orch-namespace} where {prod-short} is deployed.
 +
 [subs="+quotes,+attributes"]