minor #6014 [2.8][Form] entry_type option: replace "in favor" misuses (ogizanagi)

This PR was merged into the 2.8 branch.

Discussion
----------

[2.8][Form] entry_type option: replace "in favor" misuses

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.8+
| Fixed tickets | -

#6013 do the same for the `placeholder` option.

Commits
-------

6077f91 [Form] entry_type option: replace "in favor" misuses

Author: xabbuh

reference/forms/types/collection.rst

@@ -312,7 +312,7 @@ entry_type
 ~~~~~~~~~~
 
 .. versionadded:: 2.8
-    The ``entry_type`` option was introduced in Symfony 2.8 in favor of
+    The ``entry_type`` option was introduced in Symfony 2.8 and replaces
     ``type``, which is available prior to 2.8.
 
 **type**: ``string`` or :class:`Symfony\\Component\\Form\\FormTypeInterface` **required**