DOC: Include np.long in arrays.scalars.rst

[mtsokol]

Addresses #25015.

Hi @ngoldbaum, in this PR I updated arrays.scalars.rst so it includes np.long and updated diagrams. (the other one-line changes are fixes for some warnings that I found when building locally)

[ngoldbaum]

I think there's a desire to keep the .dia file and only modify that file and regenerate the png and PDF, from inside Dia see #23252 (comment). I'm able to open the file locally if I do sudo apt install dia then dia path/to/file.dia.

If that ends up being too cumbersome we could come back to how to handle the diagram files the numpy docs have in a few places but please give it a try first.

[mtsokol]

@ngoldbaum Sure! I restored&updated the .dia file and regenerated the new png/pdf diagram.

Nevertheless, I would argue that all diagrams could be migrated to e.g. Google Drawings or draw.io (both free), as the Dia is ancient and rather cumbersome to use. (I hope there isn't another reason to stick to it)

[ngoldbaum]

Nevertheless, I would argue that all diagrams could be migrated to e.g. Google Drawings or draw.io (both free), as the Dia is ancient and rather cumbersome to use.

Sure, I think work happened along these lines in #18501, but the diagrams never got updated . Ideally (I think) the source for the diagram would live in the docs. I'd argue it makes the most sense to use the built-in support in sphinx for the dot format, see e.g. #18501 (comment).

(I hope there isn't another reason to stick to it)

I'm pretty sure the only reason is inertia.

[ngoldbaum]

LGTM! @rossbar can you confirm what I'm saying to Mateusz about the diagrams is correct before I merge this?

[ngoldbaum]

Let's just go ahead and merge this, we can fix doc issues in a followup.