Minor changes and corrections to tutorials in the API

[thomasrobiglio]

added missing focus tutorials #475 added hyperedges in depth tutorial to API #456

I will also add a recipe for the coloring of hyperedges (as suggested in #478) + do minor changes correcting typos and imprecisions.

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Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (31b0fc8) 92.05% compared to head (123c28a) 92.05%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #479 +/- ## ======================================= Coverage 92.05% 92.05% ======================================= Files 60 60 Lines 4392 4392 ======================================= Hits 4043 4043 Misses 349 349 ```

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[thomasrobiglio]

This should be ready now.

@maximelucas I made a small addition in the in depth tutorial about the edges, in the end when you show how to combine this with the nodes. I think you wanted to say that you can combine drawing nodes and edgesusing xgi.draw or plotting the nodes and edges separately.

[maximelucas]

This is great, thanks so much Thomas.

I just left typo comments. Also I'd change "In Depth 2:" to "In depth -" for consistency with the others.

[maximelucas]

Hero 🏇🏻