Added missing header for a table in the docs.

docs/src/userguide/special_methods.rst

@@ -241,6 +241,8 @@ like :meth:`__eq__` or the single special method :meth:`__richcmp__`.
 Depending on the application, one way or the other may be better.
 
 +-----------------------+---------------------------------------+-------------+--------------------------------------------------------+
+| Name 	                | Parameters                            | Return type | 	Description                                    |
++=======================+=======================================+=============+========================================================+
 | __eq__                |self, y                                | object      | self == y                                              |
 +-----------------------+---------------------------------------+-------------+--------------------------------------------------------+
 | __ne__                |self, y                                | object      | self != y  (falls back to ``__eq__`` if not available) |