DOCS-24 - RBAC for Indexes - GA

[jpipkin1]

PLEASE READ

Following a recent back-end update, all contributors with a local clone or fork of our repository are required to run yarn install. This does not apply to direct page edits.

• [x] Yes, I've run yarn install
• [ ] No, does not apply to me

Purpose of this pull request

This pull request removes beta tagging from the following article, creates a release note, and make other updates for the GA: https://help.sumologic.com/docs/manage/users-roles/roles/rbac-for-indexes/

Ticket

Jira ticket: https://sumologic.atlassian.net/browse/DOCS-24

(The following Asana ticket was deleted because it was migrated to Jira: "[RBAC for Indexes - GA])(https://app.asana.com/0/1183741177809740/1205147588069408/f)"

Select the type of change:

• [ ] Minor Changes - Typos, formatting, slight revisions, .clabot
• [x] Update Content - Revisions, updating sections
• [ ] New Content - New features, sections, pages, tutorials
• [ ] Site and Tools - Updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

[jpipkin1]

@manashar4, could you review this pull request?

[jpipkin1]

Thank you, @kimsauce. 😄