docs: improved self-managed example configuration (#1747)

Co-authored-by: Kenneth Jenkins <[email protected]>

Author: nickytonline

content/docs/deploy/core.mdx

@@ -140,11 +140,26 @@ Pomerium is configured via [configuration variables](/docs/reference) (environme
 
 ```yaml title="config.yaml"
 # Minimal example route
+#
+# Generate a shared secret by running head -c32 /dev/urandom | base64
+# More on shared secrets at https://www.pomerium.com/docs/reference/shared-secret
 shared_secret: REPLACE_ME
+
+# Generate a cookie secret by running head -c32 /dev/urandom | base64
+# More on cookie secrets at https://www.pomerium.com/docs/reference/cookies#cookie-secret
 cookie_secret: REPLACE_ME
-idp_provider: google
-idp_client_id: REPLACE_ME
-idp_client_secret: REPLACE_ME
+
+# If the Authenticate Service URL is not set, the Pomerium Hosted Authenticate Service will be used.
+# See https://www.pomerium.com/docs/reference/service-urls#authenticate-service-url
+#
+# authenticate_service_url: REPLACE_ME
+#
+# For more information on identity provider settings, see https://pomerium.com/docs/reference/identity-provider-settings
+#
+# idp_provider: REPLACE_ME
+# idp_client_id: REPLACE_ME
+# idp_client_secret: REPLACE_ME
+
 address: :443
 
 routes: