Rendering issue ("_numYearsN_") in DayFromYear

[linusg]

This is tricky as it tries to refer to multiple similarly named variables, but the result of mixing inline code and variable syntax looks rather odd:

`_numYearsN_`

I think this should use plain code without the underscores, or the variable syntax (which would emit warning: could not find a preceding declaration for "numYearsN" (use-before-def))

[jmdyck]

That's my fault, back in PR #3092. (Didn't look close enough at the rendering.) I'll submit a fix.