Updates the page purpose info and adds reference for community contributors

Updates https://gitlab.com/gitlab-community/www-gitlab-com/blob/master/sites/handbook/source/handbook/support/license-and-renewals/workflows/self-managed/creating-wider-community-license.html.md to callout more clearly "this is the process for GitLab team members, wider community members, please refer to..."?

Closes https://gitlab.com/gitlab-org/community-relations/contributor-success/team-task/-/issues/211