Update validation.rst

Author: mohamedGasmii

validation.rst

@@ -519,8 +519,8 @@ of the form fields::
 Constraint Targets
 ------------------
 
-Constraints can be applied to a class property (e.g. ``name``), a
-getter method (e.g. ``getFullName()``) or an entire class. Property constraints
+Constraints can be applied to a class property (e.g. ``name``),
+a getter method (e.g. ``getFullName()``) or an entire class. Property constraints
 are the most common and easy to use. Getter constraints allow you to specify
 more complex validation rules. Finally, class constraints are intended
 for scenarios where you want to validate a class as a whole.