[DOC] Add ddtw distance to the API references

[Cyril-Meyer]

Reference Issues/PRs

Fixes #1720

What does this implement/fix? Explain your changes.

Add Derivative Dynamic Time Warping (DDTW) to distances modules doc.

Does your contribution introduce a new dependency? If yes, which one?

No.

Any other comments?

No.

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[Cyril-Meyer]

@all-contributors add @Cyril-Meyer for doc

[allcontributors]

@Cyril-Meyer

I've put up a pull request to add @Cyril-Meyer! 🎉

[TonyBagnall]

Lgtm, thanks