Minor changes on FAQ modal window.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

vospace-ui-frontend/src/components/modal/FAQModal.vue

@@ -46,8 +46,8 @@
       <b>A</b>: It means that the file/folder is not in place and cannot be directly downloaded, it has to be "recalled" first. This can be done by selecting the file/folder checkbox, clicking on the <i>Actions</i> dropdown menu at the top of the page and then on <i>Async recall</i>. This action will start an asynchronous job to recall the file/folder and make it available for download. An email notification is sent to the job owner when the job is queued and when it completes.
     </p>
     <div class="row">
-      <div class="col text-center mb-4">
-        <img src="./../../assets/images/async_recall.png" width=100%>
+      <div class="col">
+        <img src="./../../assets/images/async_recall.png" width=100% />
       </div>
     </div>
     <p class="my-4">