Add doc for openjs_administrative_support team (#904)

* Update GITHUB_ORG_MANAGEMENT_POLICY.md

Author: mhdawson

GITHUB_ORG_MANAGEMENT_POLICY.md

@@ -33,9 +33,12 @@ Owner permissions are granted will be reduced.
 The following groups are granted Ownership permissions:
 
 * **TSC members.**
-* **OpenJS Director of Program Management** The OpenJS Director of Program
-  Management will limit their use of the access granted to:
-    * accepting GitHub terms and conditions.
+* **OpenJS Director of Program Management**. The OpenJS Director of Program
+  Management will limit their use of the access granted to accept GitHub terms
+  and conditions. They will be added to the team called
+  [openjs-administrative-support](https://github.com/orgs/nodejs/teams/openjs-administrative-support)
+  as we require all members to be part of one or more teams in order to simplify
+  member management.
 * **Moderation team members.** The Moderation Team members
 will limit their use of the access granted to that required to carry out
 moderation across the existing repositories.