Minor tweaks

Author: javiereguiluz

reference/constraints/Unique.rst

@@ -4,7 +4,7 @@ Unique
 Validates that all the elements of the given collection are unique (none of them
 is present more than once). By default elements are compared strictly,
 so ``'7'`` and ``7`` are considered different elements (a string and an integer, respectively).
-If you want any other comparison logic to be applied, use the `normalizer`_ option.
+If you want to apply any other comparison logic, use the `normalizer`_ option.
 
 .. seealso::
 
@@ -134,12 +134,12 @@ Parameter                      Description
 
     The ``normalizer`` option was introduced in Symfony 5.3.
 
-This option allows to define the PHP callable applied to each element of the given collection before
-checking if the collection is valid.
+This option defined the PHP callable applied to each element of the given
+collection before checking if the collection is valid.
 
-For example, you may want to pass the ``'trim'`` string to apply the
-:phpfunction:`trim` PHP function to each element of the collection in order to ignore leading and trailing
-whitespace during validation.
+For example, you can pass the ``'trim'`` string to apply the :phpfunction:`trim`
+PHP function to each element of the collection in order to ignore leading and
+trailing whitespace during validation.
 
 .. include:: /reference/constraints/_payload-option.rst.inc