Add Windows Shared Runners to GitLab.com settings page of user docs
What does this MR do?
Changed description under Shared Runners section heading to callout that now, runners on Linux and Windows are offered on GitLab.Com. For the current content, added a section heading, Linux Shared Runners, and created a new section heading, Windows Shared Runners (beta) with content specific to the Windows Shared Runners.
Related to &1768 (closed)
Does this MR meet the acceptance criteria?
Conformity
Edited by Marcel Amirault