Update Configuration.md

Fix link to protected group validation

docs/Configuration.md

@@ -52,7 +52,7 @@ property | comment | required
 --- | --- | ---
 name | Name of the group as shown in UI. Sets the property `profile/givenName` of that group. | optional
 description | Description of the group | optional
-externalId | Required for groups which are synchronized from [external sources](https://jackrabbit.apache.org/oak/docs/security/authentication/externalloginmodule.html) like [LDAP](https://jackrabbit.apache.org/oak/docs/security/authentication/ldap.html) or [Adobe IMS](https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/security/ims-support#aem-configuration). This establishes a connection between an (internal) JCR group and an externally managed group (and is persisted in the group's node in the property `rep:externalId`). The value has to be in format `<external-id>;<provider-name>`.  How the external ID and provider name look like is *External Identity Provider dependent*: For **Adobe IMS** it usually is `<groupId>;ims` while for **Oak LDAP** it usually is `<LDAP-DN>;<IDP-NAME>` where LDAP-DN is the full distinguished name and IDP-NAME is configured in OSGI config PID `org.apache.jackrabbit.oak.security.authentication.ldap.impl.LdapIdentityProvider` property `provider-name`. LDAP Example: `externalId: "cn=group-name,ou=mydepart,ou=Groups,dc=comp,dc=com;IDPNAME"`. Make sure to also set the group id according to how it is extracted by the external identify provider (configurable via OSGi configuration of the external identity provider). Using groups being synced from external sources in `isMemberOf` will cause an error to avoid problems with [dynamic memberships](https://jackrabbit.apache.org/oak/docs/security/authentication/external/dynamic.html). Use `allowExternalGroupsInIsMemberOf: true` in `global_config` if you need to override this behaviour (should be used rarely). Since v1.9.3 | optional
+externalId | Required for groups which are synchronized from [external sources](https://jackrabbit.apache.org/oak/docs/security/authentication/externalloginmodule.html) like [LDAP](https://jackrabbit.apache.org/oak/docs/security/authentication/ldap.html) or [Adobe IMS](https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/security/ims-support#aem-configuration). This establishes a connection between an (internal) JCR group and an externally managed group (and is persisted in the group's node in the property `rep:externalId`). The value has to be in format `<external-id>;<provider-name>`.  How the external ID and provider name look like is *External Identity Provider dependent*: For **Adobe IMS** it usually is `<groupId>;ims` while for **Oak LDAP** it usually is `<LDAP-DN>;<IDP-NAME>` where LDAP-DN is the full distinguished name and IDP-NAME is configured in OSGI config PID `org.apache.jackrabbit.oak.security.authentication.ldap.impl.LdapIdentityProvider` property `provider-name`. LDAP Example: `externalId: "cn=group-name,ou=mydepart,ou=Groups,dc=comp,dc=com;IDPNAME"`. Make sure to also set the group id according to how it is extracted by the external identify provider (configurable via OSGi configuration of the external identity provider). Using groups being synced from external sources in `isMemberOf` will cause an error to avoid problems with [dynamic memberships](https://jackrabbit.apache.org/oak/docs/security/authentication/external/defaultusersync.html#protecting-synchronized-external-users-groups). Use `allowExternalGroupsInIsMemberOf: true` in `global_config` if you need to override this behaviour (should be used rarely). Since v1.9.3 | optional
 path | Path of the intermediate node either relative or absolute. If relative, `/home/groups` is automatically prefixed. By default some implementation specific path is choosen. Usually the full group path is the (intermediate) path concatenated with a [randomized authorizable id](https://jackrabbit.apache.org/oak/docs/apidocs/org/apache/jackrabbit/oak/security/user/RandomAuthorizableNodeName.html).  | optional
 isMemberOf | List of groups this groups is a member of. May be provided as yaml list or as comma-separated yaml string (*the use of comma-separated yaml strings is deprecated*, available to remain backwards compatible). | optional
 memberOf | Same meaning as `isMemberOf`. This property is *deprecated*, please use `isMemberOf` instead. | optional