HTML comments are not respected in code discussions Markdown

[sqs]

Repro:

Add a code discussions comment with HTML comments where the opening comment and closing comment are on different lines, like:

<!-- Test commenting out

-->

Expected: the whole thing is interpreted as an HTML comment. This is how GitHub works.

Actual: The -- are replaced with a – and the text is shown. (Example: https://sourcegraph.sgdev.org/github.com/sourcegraph/sourcegraph@deprecate-custom-git-uris/-/blob/doc/dev/uri_schemes.md#tab=discussions&threadID=137&commentID=315)

I thought I fixed this in the Markdown package we use in https://github.com/sourcegraph/docsite. So I am assigning myself as well to look into that.

[stale]

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