[DOC] Update classification notebook reference

[emmanuel-ferdman]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

Commit 548dd73 moved the location of classification.ipynb. This PR adjusts sources to changes.

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[TonyBagnall]

Thanks

[TonyBagnall]

@all-contributors add @emmanuel-ferdman for doc

[allcontributors]

@TonyBagnall

I've put up a pull request to add @emmanuel-ferdman! 🎉