additional docs on HTTP/2 connection reuse issue + workarounds

[skriss]

The HTTP/2 connection reuse issue is documented in https://projectcontour.io/resources/faq/. However, some improvements to this doc can be made:

• discuss the case of mixed TLS term + TLS passthrough
• discuss certs with multiple SANs in addition to wildcard certs
• improve discoverability of doc

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[github-actions[bot]]

The Contour project currently lacks enough contributors to adequately respond to all Issues.

This bot triages Issues according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, the Issue is closed

You can:

• Mark this Issue as fresh by commenting
• Close this Issue
• Offer to help out with triage

Please send feedback to the #contour channel in the Kubernetes Slack