Rewords and reverts

Author: javiereguiluz

form/form_collections.rst

@@ -280,8 +280,10 @@ On the rendered page, the result will look something like this:
     the ``data-prototype`` attribute is automatically added to the containing ``div``,
     and you need to adjust the following JavaScript accordingly.
 
-Now we need some JavaScript to read this attribute and dynamically add new tag forms
-when the user clicks an "Add a tag" link. This example uses `jQuery`_.
+The goal of this section will be to use JavaScript to read this attribute
+and dynamically add new tag forms when the user clicks the "Add a tag" link.
+This example uses `jQuery`_ and assumes you have it included somewhere on your
+page (e.g. using Symfony's :doc:`Webpack Encore </frontend>`).
 
 Add a ``script`` tag somewhere on your page so you can start writing some
 JavaScript. In this script, bind to the "click" event of the "Add a tag"