Add note about VCS Events only being supported for Gitlab (#880)

Author: nphilbrook

website/docs/cloud-docs/vcs/index.mdx

@@ -119,6 +119,8 @@ You can use self-hosted HCP Terraform Agents to connect HCP Terraform to your pr
 
 ## Viewing events
 
+-> **Note**: The VCS Events page is still in beta as support is being added for additional VCS providers. Currently only GitLab.com connections established after December 2020 are supported.
+
 VCS events describe changes within your organization for VCS-related actions. The VCS events page only displays events from previously processed commits in the past 30 days. The VCS page indicates previously processed commits with the message, `"Processing skipped for duplicate commit SHA"`.
 
 Viewing VCS events requires permission to manage VCS settings for the organization. ([More about permissions.](/terraform/cloud-docs/users-teams-organizations/permissions))