Renaming constraint rst files to Is* to preserve edit history

Author: Tim Stamp

reference/constraints.rst

@@ -8,9 +8,9 @@ Validation Constraints Reference
    constraints/NotBlank
    constraints/Blank
    constraints/NotNull
-   constraints/Null
-   constraints/True
-   constraints/False
+   constraints/IsNull
+   constraints/IsTrue
+   constraints/IsFalse
    constraints/Type
 
    constraints/Email

reference/constraints/False.rst renamed to reference/constraints/IsFalse.rst

@@ -1,6 +1,11 @@
 False
 =====
 
+.. caution::
+
+    The ``False`` constraint is deprecated since Symfony 2.7
+    and will be removed in Symfony 3.0. Use the ``IsFalse`` constraint instead.
+
 Validates that a value is ``false``. Specifically, this checks to see if
 the value is exactly ``false``, exactly the integer ``0``, or exactly the
 string "``0``".

reference/constraints/Null.rst renamed to reference/constraints/IsNull.rst

@@ -1,6 +1,11 @@
 Null
 ====
 
+.. caution::
+
+    The ``Null`` constraint is deprecated since Symfony 2.7
+    and will be removed in Symfony 3.0. Use the ``IsNull`` constraint instead.
+
 Validates that a value is exactly equal to ``null``. To force that a property
 is simply blank (blank string or ``null``), see the  :doc:`/reference/constraints/Blank`
 constraint. To ensure that a property is not null, see :doc:`/reference/constraints/NotNull`.

reference/constraints/True.rst renamed to reference/constraints/IsTrue.rst

@@ -1,6 +1,11 @@
 True
 ====
 
+.. caution::
+
+    The ``True`` constraint is deprecated since Symfony 2.7
+    and will be removed in Symfony 3.0. Use the ``IsTrue`` constraint instead.
+
 Validates that a value is ``true``. Specifically, this checks to see if
 the value is exactly ``true``, exactly the integer ``1``, or exactly the
 string "``1``".