Fix error codes in Customizing Validation Errors section

See gh-33354

Author: GoncaloPT

framework-docs/modules/ROOT/pages/core/validation/beanvalidation.adoc

@@ -431,7 +431,7 @@ Kotlin::
 
 A `ConstraintViolation` on `Person.name()` is adapted to a `FieldError` with the following:
 
-- Error codes `"Size.student.name"`, `"Size.name"`, `"Size.java.lang.String"`, and `"Size"`
+- Error codes `"Size.person.name"`, `"Size.name"`, `"Size.java.lang.String"`, and `"Size"`
 - Message arguments `"name"`, `10`, and `1` (the field name and the constraint attributes)
 - Default message "size must be between 1 and 10"