[#7217] add versionadded directives

Author: xabbuh

components/var_dumper/advanced.rst

@@ -198,13 +198,21 @@ method::
         'maxStringLength' => 160
     ));
 
+.. versionadded:: 3.2
+    Support for passing display options to the ``dump()`` method was introduced
+    in Symfony 3.2.
+
 The output format of a dumper can be fine tuned by the two flags 
 ``DUMP_STRING_LENGTH`` and ``DUMP_LIGHT_ARRAY`` which are passed as a bitmap
 in the third constructor argument. They can also be set via environment 
 variables when using
 :method:`assertDumpEquals($dump, $data, $message) <Symfony\\Component\\VarDumper\\Test\\VarDumperTestTrait::assertDumpEquals>`
 during unit testing.
 
+.. versionadded:: 3.1
+    The ``DUMP_STRING_LENGTH`` and ``DUMP_LIGHT_ARRAY`` flags were introduced
+    in Symfony 3.1.
+
 If ``DUMP_STRING_LENGTH`` is set, then the length of a string is displayed
 next to its content: