Add "enable" to config help (#14866)

Most help sections were missing "enable", which means it
is filtered out with `mc admin config get --json`.

Add it where missing.

internal/config/identity/openid/help.go

@@ -26,6 +26,13 @@ var (
 	}
 
 	Help = config.HelpKVS{
+		config.HelpKV{
+			Key:         config.Enable,
+			Description: "Enable or disable OpenID",
+			Type:        "on|off",
+			Optional:    true,
+			Sensitive:   false,
+		},
 		config.HelpKV{
 			Key:         DisplayName,
 			Description: "Friendly display name for this Provider/App" + defaultHelpPostfix(DisplayName),