Fixes name of database in example tutorial

Author: guineveresaenger

docs/getting-started/index.html

@@ -307,15 +307,15 @@ <h3 id="_pgo_create_cluster">pgo create cluster</h3>
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-<pre>pgo show cluster mydatabase</pre>
+<pre>pgo show cluster mycluster</pre>
 </div>
 </div>
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 <p>Also, if you like to see JSON formatted output, add the <strong>-o json</strong> flag -</p>
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-<pre>pgo show cluster mydatabase -o json</pre>
+<pre>pgo show cluster mycluster -o json</pre>
 </div>
 </div>
 <div class="paragraph">