Update billing managers' abilities in documentation

Removed mention of 'User licenses' from billing managers' abilities.

Author: Tajaly

content/admin/managing-accounts-and-repositories/managing-roles-in-your-enterprise/abilities-of-roles.md

@@ -68,7 +68,6 @@ Enterprise owners do not have access to organization settings or content by defa
 
 Billing managers only have access to your enterprise's billing settings. They can view and manage:
 
-* User licenses
 * Usage-based billing
 * Other billing settings