MAINT fix redirected link for Matthews Correlation Coefficient
#28991
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Reference Issues/PRs
No issue.
What does this implement/fix? Explain your changes.
The Wikipedia link https://en.wikipedia.org/wiki/Matthews_correlation_coefficient is automatically redirected to
https://en.wikipedia.org/wiki/Phi_coefficient.
This PR proposes to update this link too in order to avoid an invalidated link in the future.
Any other comments?