[DOC] Fix 2 typos in distances notebook

[Datadote]

What does this implement/fix? Explain your changes.

1. Sum of squares equation is missing square -> added ^2
2. Sentence grammar error, missing "as" ->added "as"

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

• No

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• The PR title starts with either [ENH], [MNT], [DOC], [BUG], [REF], [DEP] or [GOV] indicating whether the PR topic is related to enhancement, maintenance, documentation, bugs, refactoring, deprecation or governance.

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[TonyBagnall]

great spot, thanks

[TonyBagnall]

@all-contributors add @Datadote for docs

[allcontributors]

@TonyBagnall

I've put up a pull request to add @Datadote! 🎉