Fix link to help sections (Pièce-jointe)

playground/templates/playground/underscore/field-attachment-upload.mtpl

 <label>
-  <span class="label-text"><%- t('Pièce-jointe') %></span>
+  <span class="label-text js-help" data-href="#piece-jointe"><%- t('Pièce-jointe') %></span>
   <input type="text" name="title" placeholder="<%- t('Titre') %>" ></label>
 </label>
 <label>

playground/templates/playground/underscore/field-attachment-url.mtpl

 <label>
-  <span class="label-text"><%- t('Pièce-jointe') %></span>
+  <span class="label-text js-help" data-href="#piece-jointe"><%- t('Pièce-jointe') %></span>
   <input type="text" name="title" placeholder="<%- t('Titre') %>" >
   
 </label>
@@ -7,4 +7,4 @@
   <span class="label-text"></span>
   <input type="text" name="url" placeholder="<%- t('URL') %>">
   <button class="inline"><%- t('Mode Téléversement') %></button>
-</label>
\ No newline at end of file
+</label>