Migrate to Sphinx 1.0 C language constructs.
diff --git a/Doc/library/zlib.rst b/Doc/library/zlib.rst
index c325df3..a56f521 100644
--- a/Doc/library/zlib.rst
+++ b/Doc/library/zlib.rst
@@ -113,7 +113,7 @@
*bufsize* is the initial size of the buffer used to hold decompressed data. If
more space is required, the buffer size will be increased as needed, so you
don't have to get this value exactly right; tuning it will only save a few calls
- to :cfunc:`malloc`. The default size is 16384.
+ to :c:func:`malloc`. The default size is 16384.
.. function:: decompressobj([wbits])