apply some fixes to the Form events chapter

* remove serial commas
* replace wrong event constant
* replace reference to form events overview that did not provide any
  context with a more meaningful `seealso` section

Author: xabbuh

components/form/form_events.rst

@@ -59,8 +59,6 @@ The ``FormEvents::PRE_SET_DATA`` event is dispatched at the beginning of the
 * Modify the data given during pre-population;
 * Modify a form depending on the pre-populated data (adding or removing fields dynamically).
 
-:ref:`Form Events Information Table<component-form-event-table>`
-
 ===============  ========
 Data Type        Value
 ===============  ========
@@ -69,6 +67,11 @@ Normalized data  ``null``
 View data        ``null``
 ===============  ========
 
+.. seealso::
+
+    See all form events at a glance in the
+    :ref:`Form Events Information Table <component-form-event-table>`.
+
 .. caution::
 
     During ``FormEvents::PRE_SET_DATA``,
@@ -94,8 +97,6 @@ The ``FormEvents::POST_SET_DATA`` event is dispatched at the end of the
 method. This event is mostly here for reading data after having pre-populated
 the form.
 
-:ref:`Form Events Information Table<component-form-event-table>`
-
 ===============  ====================================================
 Data Type        Value
 ===============  ====================================================
@@ -104,6 +105,11 @@ Normalized data  Model data transformed using a model transformer
 View data        Normalized data transformed using a view transformer
 ===============  ====================================================
 
+.. seealso::
+
+    See all form events at a glance in the
+    :ref:`Form Events Information Table <component-form-event-table>`.
+
 .. sidebar:: ``FormEvents::POST_SET_DATA`` in the Form component
 
     The ``Symfony\Component\Form\Extension\DataCollector\EventListener\DataCollectorListener``
@@ -134,8 +140,6 @@ It can be used to:
 * Change data from the request, before submitting the data to the form;
 * Add or remove form fields, before submitting the data to the form.
 
-:ref:`Form Events Information Table<component-form-event-table>`
-
 ===============  ========================================
 Data Type        Value
 ===============  ========================================
@@ -144,6 +148,11 @@ Normalized data  Same as in ``FormEvents::POST_SET_DATA``
 View data        Same as in ``FormEvents::POST_SET_DATA``
 ===============  ========================================
 
+.. seealso::
+
+    See all form events at a glance in the
+    :ref:`Form Events Information Table <component-form-event-table>`.
+
 .. sidebar:: ``FormEvents::PRE_SUBMIT`` in the Form component
 
     The ``Symfony\Component\Form\Extension\Core\EventListener\TrimListener``
@@ -162,8 +171,6 @@ transforms back the normalized data to the model and view data.
 
 It can be used to change data from the normalized representation of the data.
 
-:ref:`Form Events Information Table<component-form-event-table>`
-
 ===============  ===================================================================================
 Data Type        Value
 ===============  ===================================================================================
@@ -172,6 +179,11 @@ Normalized data  Data from the request reverse-transformed from the request usin
 View data        Same as in ``FormEvents::POST_SET_DATA``
 ===============  ===================================================================================
 
+.. seealso::
+
+    See all form events at a glance in the
+    :ref:`Form Events Information Table <component-form-event-table>`.
+
 .. caution::
 
     At this point, you cannot add or remove fields to the form.
@@ -192,16 +204,19 @@ model and view data have been denormalized.
 
 It can be used to fetch data after denormalization.
 
-:ref:`Form Events Information Table<component-form-event-table>`
-
 ===============  =============================================================
 Data Type        Value
 ===============  =============================================================
 Model data       Normalized data reverse-transformed using a model transformer
-Normalized data  Same as in ``FormEvents::POST_SUBMIT``
+Normalized data  Same as in ``FormEvents::SUBMIT``
 View data        Normalized data transformed using a view transformer
 ===============  =============================================================
 
+.. seealso::
+
+    See all form events at a glance in the
+    :ref:`Form Events Information Table <component-form-event-table>`.
+
 .. caution::
 
     At this point, you cannot add or remove fields to the form.
@@ -213,21 +228,21 @@ View data        Normalized data transformed using a view transformer
     information about the forms.
     The ``Symfony\Component\Form\Extension\Validator\EventListener\ValidationListener``
     subscribes to the ``FormEvents::POST_SUBMIT`` event in order to
-    automatically validate the denormalized object, and update the normalized
-    as well as the view's representations.
+    automatically validate the denormalized object and to update the normalized
+    representation as well as the view representations.
 
 Registering Event Listeners or Event Subscribers
 ------------------------------------------------
 
 In order to be able to use Form events, you need to create an event listener
-or an event subscriber, and register it to an event.
+or an event subscriber and register it to an event.
 
 The name of each of the "form" events is defined as a constant on the
 :class:`Symfony\\Component\\Form\\FormEvents` class.
 Additionally, each event callback (listener or subscriber method) is passed a
 single argument, which is an instance of
 :class:`Symfony\\Component\\Form\\FormEvent`. The event object contains a
-reference to the current state of the form, and the current data being
+reference to the current state of the form and the current data being
 processed.
 
 .. _component-form-event-table: