Fix typo

Per PostgreSQL bug #17738

Author: mhagander

templates/index.html

@@ -34,7 +34,7 @@ <h2>New to PostgreSQL?</h2>
           There is a wealth of information to be found describing how to <a href="/download/">install</a> and <a href="/docs/">use</a> PostgreSQL through the <a href="/docs/">official documentation</a>.
           The <a href="/community/">open source community community</a>
           provides many helpful places to become familiar with PostgreSQL,
-          discover how it works, and find career opportunities. Learm more on
+          discover how it works, and find career opportunities. Learn more on
           how to <a href="/community/">engage with the community</a>.
         </p>
       </div>