Add new member permission setting info (#11299)

* Add new member permission setting info

Add a section for the new option to let existing members invite anyone they like without needing additional permissions.

* Update docs/organization/membership/index.mdx

* Update docs/organization/membership/index.mdx

Author: lizokm

docs/organization/membership/index.mdx

@@ -115,6 +115,13 @@ Projects can only be accessed by that project's team(s). Team Admins, Org Manage
 
 All Org Members can get access to a project by joining a team associated with that project.
 
+### Adding New Members 
+<Note>
+This feature is currently only available for [Early Adopters](/organization/early-adopter-features/).
+</Note>
+
+Users with Manager and Owner-level permissions can add, remove, and change members for a project or organization. They can also toggle on the "Let Members Invite Others" setting to allow any org member to freely invite anyone they like without needing org owner or manager approval.
+
 ### Open Membership
 
 Team membership is open by default. All members can join, leave, and add other members to teams.