Docs: Fine-grained access control refactor (#47536)

* fleshing out About topic

* docs, fgac refactor initial draft

* updated FGAC with service account details

* finalized restructure

* make prettier, corrects spelling

* fixes typo

* adds rollout strategy topic

* started name change

* renamed to rbac throughout docs

* copy edit to about and actions and scopes docs

* finishes content reorg

* draft of refactored refactored docs

* corrects relrefs

* formatting tweaks

* fixes typo

* copy updates to about rbac

* rbac rollout docs edits

* update rbac role assignment docs

* content update to manage rbac roles doc

* sort and reorder roles reference in rbac docs

* alphabetize permissions table

* Update docs/sources/enterprise/settings-updates.md

Co-authored-by: Mitch Seaman <mjseaman@users.noreply.github.com>

* incorporates feedback, makes prettier

* update http api references in rbac docs

* fix broken refs and improve wording on enabling RBAC provisioning

Co-authored-by: eleijonmarck <eric.leijonmarck@gmail.com>
Co-authored-by: Mitchel Seaman <mitchel.seaman@gmail.com>
Co-authored-by: Mitch Seaman <mjseaman@users.noreply.github.com>

docs/sources/http_api/_index.md

@@ -39,7 +39,7 @@ dashboards, creating users, and updating data sources.
 
 Grafana Enterprise includes all of the Grafana OSS APIs as well as those that follow:
 
-- [Fine-grained access control API]({{< relref "access_control.md" >}})
+- [Role-based access control API]({{< relref "access_control.md" >}})
 - [Data source permissions API]({{< relref "datasource_permissions.md" >}})
 - [External group sync API]({{< relref "external_group_sync.md" >}})
 - [License API]({{< relref "licensing.md" >}})