[Docs] Typo fix in complexity_dimension() docstring

[JoseAlanis]

Description

This PR fixes a typo in the docstring of the function complexity_dimension(). The function should return the optimal embedding dimension and not the delay, as stated in the docstring.

Proposed Changes

• I changed the docstring (line 75).
• Some changes made by black formatter

Checklist

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• I have read the CONTRIBUTING file.
• My PR is targetted at the dev branch (and not towards the master branch).
• I ran the CODE CHECKS on the files I added or modified and fixed the errors.
• I have added the newly added features to News.rst (if applicable)

[welcome]

Thanks for opening this pull request! We'll make sure it's perfect before merging 🤗
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[DominiqueMakowski]

Good catch, thanks!

[welcome]

Congrats on merging your first pull request! 🎉🍾 We're looking forward to your next one!