DesignDoc Markdown table was broken

Added a missing newline

googlemock/docs/DesignDoc.md

@@ -198,6 +198,7 @@ Google Test (the name is chosen to match `static_assert` in C++0x).
 If you are writing a function that returns an `ACTION` object, you'll
 need to know its type.  The type depends on the macro used to define
 the action and the parameter types.  The rule is relatively simple:
+
 | **Given Definition**     | **Expression**               | **Has Type**             |
 |:-------------------------|:-----------------------------|:-------------------------|
 | `ACTION(Foo)`            | `Foo()`                      | `FooAction`              |