Update Doc/library/stdtypes.rst

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: hu-jeff

Doc/library/stdtypes.rst

@@ -4427,7 +4427,7 @@ the ``%`` operator (modulo).
 This is also known as the bytes *formatting* or *interpolation* operator.
 Given ``format % values`` (where *format* is a bytes object), ``%`` conversion
 specifications in *format* are replaced with zero or more elements of *values*.
-The effect is similar to using :c:func:`sprintf` in the C language.
+The effect is similar to using the :c:func:`sprintf` function in the C language.
 
 If *format* requires a single argument, *values* may be a single non-tuple
 object. [5]_  Otherwise, *values* must be a tuple with exactly the number of