Docs lint rule for "GitLab Shell"

Problem to solve

Enforce some consistency to the name "GitLab Shell".

Further details

I've seen all sorts of terms, like "GitLab-shell", "GitLab-Shell", and "GitLab Shell". There's this doc with all of them. 😑 Can we lint for the term to make sure it's spelled correctly ("GitLab Shell")?

Proposal

Create a Vale rule for this

Who can address the issue

TW Test Automation Committee

Other links/references

!36302 (merged)