Update sankey-diagram.md (#2291)
Update sankey-diagram.md (#2291)

* Update sankey-diagram.md

Add colorful links to the Sankey diagram.

* Apply suggestions from code review

More complex Sankey diagram with colored links - setting the link color in one line, add the comment why 'magenta' is changed to its rgba value.

Co-Authored-By: Emmanuelle Gouillart <efdb8f7f2fe9c47e34dfe1fb7c491d0638ec2d86@plot.ly>

* Change paragraph title to 'More complex Sankey diagram with colored links'

Co-authored-by: Emmanuelle Gouillart <efdb8f7f2fe9c47e34dfe1fb7c491d0638ec2d86@plot.ly>
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