Red boxes around some ÷ operators

[jdghunt]

In a few places in the spec, red boxes are shown around ÷ operators. E.g. sections 6.4.3, 6.4.4, E.4.1 & E.4.2. I assume this to be an issue with the markdown renderer. See below for an example screenshot:

I've checked this with Peter de Rivaz and we believe that there is nothing wrong with what is displayed, apart from the red boxes themselves, but the presence of the red boxes may concern some readers if they suspect that something might be displaying wrong, as I initially did.

I believe this to be a longstanding issue since it affects all versions of the spec that I've seen going back to mid 2018, but it would be good to fix it up if possible.

If it makes any difference whatsoever, I'm viewing the PDF files in Adobe Reader Version 2020.012.20048 (a very recent version) when I see this issue.