Merge branch 'update-internal-scim-api' into 'master'

Update SCIM API internal labeling

See merge request gitlab-org/gitlab!44365

doc/api/scim.md

 ---
-stage: none
-group: unassigned
+type: reference, howto
+stage: Manage
+group: Access
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 ---
 
-# SCIM API **(SILVER ONLY)**
+# SCIM API (SYSTEM ONLY) **(SILVER ONLY)**
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/9388) in [GitLab Silver](https://about.gitlab.com/pricing/) 11.10.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/9388) in [GitLab.com Silver](https://about.gitlab.com/pricing/) 11.10.
 
-The SCIM API implements the [RFC7644 protocol](https://tools.ietf.org/html/rfc7644).
+The SCIM API implements the [RFC7644 protocol](https://tools.ietf.org/html/rfc7644). As this API is for
+**system** use for SCIM provider integration, it is subject to change without notice.
 
-CAUTION: **Caution:**
-This API is for internal system use for connecting with a SCIM provider. While it can be used directly, it is subject to change without notice.
-
-NOTE: **Note:**
-[Group SSO](../user/group/saml_sso/index.md) must be enabled for the group. For more information, see [SCIM setup documentation](../user/group/saml_sso/scim_setup.md#requirements).
+To use this API, [Group SSO](../user/group/saml_sso/index.md) must be enabled for the group.
+This API is only in use where [SCIM for Group SSO](../user/group/saml_sso/scim_setup.md) is enabled. It's a prerequisite to the creation of SCIM identities.
 
 ## Get a list of SAML users
 
-NOTE: **Note:**
-This endpoint is used as part of the SCIM syncing mechanism and it only returns
+This endpoint is used as part of the SCIM syncing mechanism. It only returns
 a single user based on a unique ID which should match the `extern_uid` of the user.
 
 ```plaintext