Merge branch '6.2' into 6.3

* 6.2:
  [Validator] Add a few missing option default values

Author: javiereguiluz

reference/constraints/UniqueEntity.rst

@@ -120,7 +120,7 @@ Options
 em
 ~~
 
-**type**: ``string``
+**type**: ``string`` **default**: ``null``
 
 The name of the entity manager to use for making the query to determine
 the uniqueness. If it's left blank, the correct entity manager will be
@@ -130,7 +130,7 @@ not need to be used.
 ``entityClass``
 ~~~~~~~~~~~~~~~
 
-**type**: ``string``
+**type**: ``string`` **default**: ``null``
 
 By default, the query performed to ensure the uniqueness uses the repository of
 the current class instance. However, in some cases, such as when using Doctrine

reference/constraints/_comparison-propertypath-option.rst.inc

@@ -1,7 +1,7 @@
 ``propertyPath``
 ~~~~~~~~~~~~~~~~
 
-**type**: ``string``
+**type**: ``string`` **default**: ``null``
 
 It defines the object property whose value is used to make the comparison.
 

reference/constraints/_groups-option.rst.inc

@@ -1,7 +1,7 @@
 ``groups``
 ~~~~~~~~~~
 
-**type**: ``array`` | ``string``
+**type**: ``array`` | ``string`` **default**: ``null``
 
 It defines the validation group or groups of this constraint. Read more
 about :doc:`validation groups </validation/groups>`.