[Validator] Update the name of a level in PasswordStrength constraint

Author: javiereguiluz

reference/constraints/PasswordStrength.rst

@@ -77,11 +77,12 @@ Available Options
 ``minScore``
 ~~~~~~~~~~~~
 
-**type**: ``integer`` **default**: ``PasswordStrength::STRENGTH_REASONABLE`` (``2``)
+**type**: ``integer`` **default**: ``PasswordStrength::STRENGTH_MEDIUM`` (``2``)
 
 The minimum required strength of the password. Available constants are:
+
 * ``PasswordStrength::STRENGTH_WEAK`` = ``1``
-* ``PasswordStrength::STRENGTH_REASONABLE`` = ``2``
+* ``PasswordStrength::STRENGTH_MEDIUM`` = ``2``
 * ``PasswordStrength::STRENGTH_STRONG`` = ``3``
 * ``PasswordStrength::STRENGTH_VERY_STRONG`` = ``4``