Renaming the article

Reason: If you read "How to Embed a Collection of Forms" at https://symfony.com/doc/3.4/forms.html#learn-more it doesn't really reveal what this is all about. So I changed the title to something which describes it better from the user's point of view.

I also removed all occurrences of "you" in the first paragraph, see symfony#13445 (comment)

Author: ThomasLandauer

form/form_collections.rst

@@ -1,15 +1,18 @@
 .. index::
    single: Form; Embed collection of forms
 
-How to Embed a Collection of Forms
-==================================
+Edit Related Entities in a Single Form
+======================================
 
-In this article, you'll learn how to create a form that embeds a collection
-of many other forms. This could be useful, for example, if you had a ``Task``
-class and you wanted to edit/create/remove many ``Tag`` objects related to
-that Task, right inside the same form.
+To edit associated entities in the same form, Symfony has the concept of
+Form "Collections". Think of it as a series of sub-forms, embedded into
+the main form.
 
-Let's start by creating a ``Task`` entity::
+The example used in this article is a ``Task`` entity that relates to
+a ``Tag`` entitiy. The goal is to create a single form for tasks, that
+also allows to edit/create/remove many tags associated with that task.
+
+Here's the ``Task`` entity::
 
     // src/AppBundle/Entity/Task.php
     namespace AppBundle\Entity;