Fix link for dataset in classification notebook

[Mr-Geekman]

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• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Proposed Changes

Fix link for dataset in classification notebook

Closing issues

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Codecov Report

Merging #1351 (b0e6a98) into master (db6b358) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master    #1351   +/-   ##
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  Coverage   89.13%   89.13%           
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  Files         204      204           
  Lines       12687    12687           
=======================================
  Hits        11309    11309           
  Misses       1378     1378           

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