Workaround go-md2man warning about HTML comments #2129
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go-md2man 2.0.2 (not 1.0.10) does not recognize HTML comments, triggering a warning.
Work around that, just to have a silent build.
This uses a "comment" syntax by defining a reference-style link ( https://stackoverflow.com/a/20885980 ).
Alternatively, go-md2man does recognize comments inline inside a paragraph, so preceding the HTML comment with a space would probably work as well.
Either way is weird, and we can't add a comment to explain the comment mechanism... so use the more visually distinct alternative to hopefully minimize regressions; using a leading space would tempt future readers to just remove the space, thinking it's a mistake.
Fixes #2128 .