change wording

routes/settings/instances/index.html

@@ -13,7 +13,7 @@
         <SettingsListItem href="/settings/instances/{{instance.name}}" label="{{instance.name}}"/>
       {{/each}}
     </SettingsList>
-    <p><a href="/settings/instances/add">Add an instance</a></p>
+    <p><a href="/settings/instances/add">Add another instance</a></p>
     {{else}}
     <p><a href="/settings/instances/add">Connect to an instance</a> to start using Pinafore.</p>
     {{/if}}