DOC: Minor fix in inline code example of ufunc reference

[adeak]

There's a slight inconsistency with capitalization of example names in the ufunc reference (in the "Tip" box right before https://numpy.org/devdocs/reference/ufuncs.html#trigonometric-functions). I changed them all to be capitalized in the snippet, as that's what the majority was like.

[adeak]

I can't find the error in the failing test, but due to the nature of the change I assume it's a fluke.

[charris]

Thanks @adeak .

[adeak]

Thank you too :)