don't mention implementation detail

Doc/library/operator.rst

@@ -12,11 +12,11 @@
    from operator import itemgetter, iadd
 
 
-The :mod:`operator` module exports a set of functions implemented in C
-corresponding to the intrinsic operators of Python.  For example,
-``operator.add(x, y)`` is equivalent to the expression ``x+y``.  The function
-names are those used for special class methods; variants without leading and
-trailing ``__`` are also provided for convenience.
+The :mod:`operator` module exports a set of functions corresponding to the
+intrinsic operators of Python.  For example, ``operator.add(x, y)`` is
+equivalent to the expression ``x+y``.  The function names are those used for
+special class methods; variants without leading and trailing ``__`` are also
+provided for convenience.
 
 The functions fall into categories that perform object comparisons, logical
 operations, mathematical operations and sequence operations.