Merge pull request travis-ci#2491 from travis-ci/correct-href-typo

Correct typo on `href`

Author: muizzk

index.html

@@ -46,7 +46,7 @@ <h2>Deployment Guides</h2>
       <h2>Common Questions</h2>
       <ul>
         <li><a href="/user/customizing-the-build/#what-repository-providers-or-version-control-systems-can-i-use">What repository providers can I use?</a></li>
-        <li><a herf="/user/reference/bionic/">Can I use Ubuntu 18.04 Bionic for my builds?</a></li>
+        <li><a href="/user/reference/bionic/">Can I use Ubuntu 18.04 Bionic for my builds?</a></li>
         <li><a href="/user/reference/xenial/">Can I use Ubuntu Xenial for my builds?</a><li>
         <li><a href="/user/notifications/#changing-the-email-address-for-build-notifications">How do I change the notification email address?</a><li>
         <li><a href="/user/ip-addresses/">What IP addresses do the builds use?</a></li>