DOC Clarifies the mailing list entry on the main page
<li><strong>About us:</strong> See <a href="about.html#people">authors</a> and <a href="developers/contributing.html">contributing</a></li>
<li><strong>More Machine Learning:</strong> Find <a href="related_projects.html">related projects</a></li>
<li><strong>Questions?</strong> See <a href="faq.html">FAQ</a> and <a href="https://stackoverflow.com/questions/tagged/scikit-learn">stackoverflow</a></li>
- <li><strong>Mailing list:</strong> <a href="https://mail.python.org/mailman/listinfo/scikit-learn">scikit-learn@python.org</a></li>
+ <li><strong>Subscribe to the</strong> <a href="https://mail.python.org/mailman/listinfo/scikit-learn">mailing list</a></li>
<li><strong>Gitter:</strong> <a href="https://gitter.im/scikit-learn/scikit-learn">gitter.im/scikit-learn</a></li>
<li><strong>Twitter:</strong> <a href="https://twitter.com/scikit_learn">@scikit_learn</a></li>
<li><strong>Twitter (commits):</strong> <a href="https://twitter.com/sklearn_commits">@sklearn_commits</a></li>
