Add missing card title

apps/reference/docs/about.mdx

@@ -149,6 +149,7 @@ You can use it completely, or just the features you need.
       <ButtonCard
         class="card"
         to={useBaseUrl('/guides/platform/logs')}
+        title={'Observability'}
         description={'Monitor and debug your infrastucture.'}
         style={{ height: '100%' }}
       >