Update web terminal note for shared runners

The current documentation suggests that a user can not use his own
runner for a specific group or project. At first I thought this was the
case but it is not true, since we do allow websocket connections on
GitLab.com, this was discovered as part of the investigation on
https://gitlab.com/gitlab-org/gitlab-ce/issues/52611.

doc/ci/interactive_web_terminal/index.md

-# Interactive Web Terminals **[CORE ONLY]**
+# Interactive Web Terminals
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/50144) in GitLab 11.3.
 
@@ -9,10 +9,11 @@ is deployed, some [security precautions](../../administration/integration/termin
 taken to protect the users.
 
 NOTE: **Note:**
-GitLab.com does not support interactive web terminal at the moment – neither
-using shared GitLab.com runners nor your own runners. Please follow
-[this issue](https://gitlab.com/gitlab-org/gitlab-ce/issues/52611) for
-progress. 
+[Shared runners on GitLab.com](../quick_start/README.md#shared-runners) do not
+provide an interactive web terminal. Follow [this
+issue](https://gitlab.com/gitlab-org/gitlab-ce/issues/52611) for progress on
+adding support. For groups and projects hosted on GitLab.com, interactive web
+terminals are available when using your own group or project runner.
 
 ## Configuration