Documentation on ingress.kubernetes.io/force-ssl-redirect is outdated

[jwnx]

What steps did you take and what happened:
Since #252, Contour leverages HttpsRedirect instead of RequireTls to enforce force-ssl-redirect. All documentation versions are affected.

What did you expect to happen:
The documentation would describe the correct behavior.

Anything else you would like to add:
The ingress.kubernetes.io/force-ssl-redirect annotation was introduced by #149 in Jan, 2018. Its documentation was first written in 9e166f3 on Fev 6th, 2018 and the #252 fix was merged on Feb 26th, 2018, but the documentation wasn't updated since then.

Environment:
N/A

[github-actions]

Hey @jwnx! Thanks for opening your first issue. We appreciate your contribution and welcome you to our community! We are glad to have you here and to have your input on Contour. You can also join us on our mailing list and in our channel in the Kubernetes Slack Workspace