Broken link detected by CI

[github-actions]

Periodic link aliveness CI detected a broken link. Please see the periodic job
results for details.

[dfarrell07]

This link does work, and it seems syntactically correct/the only way. 🤔

[dfarrell07]

Debugging, this is what I have so far.

It broke when we upgraded from 228fbf4ffb2a86a65314866e9b2322b519fd885f to 4d97ad89bbb0de4be573a9d7a2fc0ce900afc519.

https://github.com/submariner-io/enhancements/actions?query=workflow%3APeriodic

There are not any code changes to the GHA between those versions, only docs changes and a bump of the underlying linter:

gaurav-nelson/github-action-markdown-link-check@228fbf4...4d97ad8

The linter was bumped from 3.8.7 to 3.10.2:

gaurav-nelson/github-action-markdown-link-check@ca705e7

Other people seem to have similar issues after the bump:

tcort/markdown-link-check#91 (comment)
gaurav-nelson/github-action-markdown-link-check#129 (comment)

The upstream lib reported a bug/added a UT for HTML anchors in tcort/markdown-link-check#193, which is what we hit in submariner-io/submariner-website#881. That's tracked by tcort/markdown-link-check#195, which isn't fixed. But I don't think that's the same issue as we're hitting here or the comments above describe.

I feel like I may be missing something obvious, or this is a timeout/rate-limit with a wrong HTTP error code. It's nuts that very similar links work.

### Multiple Active Gateway Packet Flow with Globalnet
[Multiple Active Gateway Packet Flow with Globalnet](#multiple-active-gateway-packet-flow-with-globalnet)
[✖] #multiple-active-gateway-packet-flow-with-globalnet → Status: 404

### Multiple Active Gateway Packet Flow without Globalnet
[Multiple Active Gateway Packet Flow without Globalnet](#multiple-active-gateway-packet-flow-without-globalnet)
[✓] #multiple-active-gateway-packet-flow-without-globalnet

[dfarrell07]

Maybe let's just revert back to 228fbf4ffb2a86a65314866e9b2322b519fd885f.