Remove parenthetical remark that is confusing now that the module is not named...

Remove parenthetical remark that is confusing now that the module is not named "__builtin__" anymore.

Doc/library/builtins.rst

@@ -32,9 +32,8 @@ that wants to implement an :func:`open` function that wraps the built-in
 
        # ...
 
-As an implementation detail, most modules have the name ``__builtins__`` (note
-the ``'s'``) made available as part of their globals.  The value of
-``__builtins__`` is normally either this module or the value of this modules's
-:attr:`__dict__` attribute.  Since this is an implementation detail, it may not
-be used by alternate implementations of Python.
-
+As an implementation detail, most modules have the name ``__builtins__`` made
+available as part of their globals.  The value of ``__builtins__`` is normally
+either this module or the value of this modules's :attr:`__dict__` attribute.
+Since this is an implementation detail, it may not be used by alternate
+implementations of Python.