Removing outdated jQuery note

Looks like this was just forgotten at symfony#15455

The other text I deleted merely repeated what has already been said above:

> Now let the users add as many tag forms as they need directly in the browser.

Author: ThomasLandauer

form/form_collections.rst

@@ -280,13 +280,7 @@ 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 add some 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 to include the required
-functionality with JavaScript:
+Now add the required functionality with JavaScript:
 
 .. code-block:: javascript
 
@@ -654,7 +648,6 @@ the relationship between the removed ``Tag`` and ``Task`` object.
     the `symfony-collection`_ package based on jQuery for the rest of browsers.
 
 .. _`Owning Side and Inverse Side`: https://www.doctrine-project.org/projects/doctrine-orm/en/current/reference/unitofwork-associations.html
-.. _`jQuery`: http://jquery.com/
 .. _`JSFiddle`: https://jsfiddle.net/ey8ozh6n/
 .. _`@a2lix/symfony-collection`: https://github.com/a2lix/symfony-collection
 .. _`symfony-collection`: https://github.com/ninsuo/symfony-collection