Fixed casing in URL for reference docs layout.

Author: JamesKovacs

Docs/reference/themes/mongodb/layouts/partials/header/topRight.html

@@ -1,6 +1,6 @@
 <div>
 <div class="nav-items pull-right">
-  <a href="https://University.mongodb.com" data-toggle="tooltip" data-placement="bottom" title="Try MongoDB in the browser">Learn</a>
+  <a href="https://university.mongodb.com" data-toggle="tooltip" data-placement="bottom" title="Try MongoDB in the browser">Learn</a>
   <a href="https://www.mongodb.com/try" data-toggle="tooltip" data-placement="bottom" title="Download MongoDB">Downloads</a>
   <a href="https://www.mongodb.com/community" data-toggle="tooltip" data-placement="bottom" title="Get involved with MongoDB">Community</a>
   <a href="https://www.mongodb.com/docs" data-toggle="tooltip" data-placement="bottom" title="The MongoDB Documentation">Docs</a>