fixing whitespace

Author: weaverryan

reference/constraints/NotBlank.rst

@@ -1,9 +1,10 @@
 NotBlank
 ========
 
-Validates that a value is not blank, defined as not strictly ``false``, not equal to a blank
-string and also not equal to ``null``. To force that a value is simply not equal to
-``null``, see the :doc:`/reference/constraints/NotNull` constraint.
+Validates that a value is not blank, defined as not strictly ``false``, not
+equal to a blank string and also not equal to ``null``. To force that a value
+is simply not equal to ``null``, see the :doc:`/reference/constraints/NotNull`
+constraint.
 
 +----------------+------------------------------------------------------------------------+
 | Applies to     | :ref:`property or method <validation-property-target>`                 |