4.4.2 broken rendering of endash

[bmerry]

The source contains \textasciitilde $40--100\,\mathrm{ns}$ but the -- doesn't render as an endash is math mode.

[pllim]

Feel free to PR!

[bmerry]

I don't have a conda environment, so I'm not able to actually build and check the rendering of a fix.

Note that this isn't just a case of the dash being slightly the wrong size. You get two dashes instead of one. It's easy to miss because one is at the end of a line and the next is at the start of the following line.

[adrn]

I fixed this in a commit that I will push soon - thanks @bmerry