Clarify GitLab support (#1089)

* Clarify gitlab support

GitLab only supports a set list of media types they control. On-Prem customers can customize that.

Signed-off-by: Brad Micklea <7644938+bmicklea@users.noreply.github.com>

* Fixed link

Signed-off-by: Brad Micklea <7644938+bmicklea@users.noreply.github.com>

* Further clarification

Signed-off-by: Brad Micklea <7644938+bmicklea@users.noreply.github.com>

---------

Signed-off-by: Brad Micklea <7644938+bmicklea@users.noreply.github.com>

Author: bmicklea

docs/src/docs/integrations/integrations.md

@@ -27,7 +27,7 @@ The most fully-featured model registry integration for ModelKits is the [Jozu Hu
 * Azure Container Registry
 * Docker Hub
 * GitHub Packages Container Registry
-* GitLab Container Registry
+* GitLab Container Registry (on-prem only, [see their docs](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/supported-media-types.md?ref_type=heads))
 * Google Artifact Registry
 * Harbor
 * IBM Cloud Container Registry