[MNT] Distance module changed to method rather than metric

[chrisholder]

Reference Issues/PRs

#2403 #2379

What does this implement/fix? Explain your changes.

Typing "measure=" felt weird. I think I much prefer "method". This PR changes measure to method.

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

Any other comments?

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[TonyBagnall]

I preferred metric ....