Add stuty -> study and variations

It seems common to write "study" with a T instead of D:

`stuty` appears in
https://github.com/boschresearch/cx-testdata-2-edc/blob/e06311fea52ceb8263351c169b4bf4eda2acc742/dependencies.py#L45

`stutying` appears in
https://github.com/lukas-brn/lukas-brn/blob/9ff9ef645dcc9b820d027917cfb1b0597094dae6/README.md?plain=1#L33

`stuties` appears in
https://github.com/sanket293/shiv-pooja-angular-/blob/a22010662385646650a182a9eb4af571a597a3d5/todo.txt#L18