Improve docs of .raw_dim(), .shape(), and .strides()

[jturner314]

This should help prevent a common source of confusion, even among relatively experienced ndarray users: using .shape() where .raw_dim() is necessary. This has come up multiple times in the past.

Please let me know if the wording could be improved.

[LukeMathWalker]

Yes please ❤️

[bluss]

@jturner314 @LukeMathWalker Is it possible you want to join maintenance team @LukeMathWalker? I'm away more than not, so I'm really not helping unfortunately. If you drive development you can also make decisions independently from me. (That's how it should be if I don't show up.)

[LukeMathWalker]

I'd be more than happy to join the maintenance team @bluss: I have learned most of the non-trivial things I know about Rust using/messing up/trying to expand ndarray and putting that code out for review by you and @jturner314 - it would be exciting to get more involved with the project, giving something back.
I can't say I am familiar with the deepest and darkest corners of ndarray, but the goal is getting there 😛

[jturner314]

@bluss @LukeMathWalker I've added @LukeMathWalker as a GitHub team member and collaborator. Welcome to the team! You've been doing great work on ndarray-stats and ndarray, and I'm glad to have you with us!