Fix typo in HotellingT2Test name

[nalimilan]

Introduced by #158.

[ararslan]

Thank you! Do you think it'd be worth adding a deprecation for the old name? Though it looks like no registered packages are referencing it¹ so it should be safe to just change.

Footnotes

1. https://juliahub.com/ui/Search?type=symbols&q=HotellingT2TestTest ↩

[nalimilan]

Given how ridiculous the old name is, I'd say we can assume nobody uses it or it would have been reported. :-)

[ararslan]

You mean you've never used Hotelling's $T^2$ test test? It's twice as powerful as Hotelling's $T^2$ test, but not nearly as powerful as Hotelling's $T^2$ test test test.