enhance bin and crop API docstring with examples

[bobleesj]

What this PR does

crop and bin are commonly used during the first few cells of 4D-STEM data processing.

While its usage can be learned from the notebooks, this PR adds examples to the documentation so users can use it w/o searching through notebooks (experienced by @bobleesj since RAM is precious)

What should reviewer(s) do

No function changed. Just enhancing the doc. Please take a quick look at the in-line.

[bobleesj]

@arthurmccray ready for review - I think I asked you before what was the best way to crop 4dstem dataset so that I can fit stuff in VRAM. I am sure there will be another @bobleesj down the road.

[bobleesj]

I was also looking at whether modifiy_in_place=true should free the initial memory. not sure whether it's happening in the current design.

But I think being able to free the original array makes this crop function more useful than using native slicing methods (which returns a view)??

[arthurmccray]

lgtm!

regarding modify_in_place=True, memory profiling can be a little annoying in python, but I'm pretty sure that this should work as expected and free the memory. And it's nice having both this and the slicing methods so we have the option for views as well :)

[bobleesj]

@arthurmccray Thanks Arthur for your quick review. If it looks ok! please merge! I will just double check whether it frees the memory!