[Validator] Add missing dot

sebpacz · web-flow · commit bd8f1e35f728 · 2021-10-26T20:25:03.000+02:00
The default NotBlank constraint message ends with a dot.
diff --git a/validation.rst b/validation.rst
@@ -179,7 +179,7 @@ message:
 .. code-block:: text
 
     Object(App\Entity\Author).name:
-        This value should not be blank
+        This value should not be blank.
 
 If you insert a value into the ``name`` property, the happy success message
 will appear.
