Improve the documented advice on how to best use heapq.heapreplace().
diff --git a/Modules/_heapqmodule.c b/Modules/_heapqmodule.c
index 21df796..13e6a3d 100644
--- a/Modules/_heapqmodule.c
+++ b/Modules/_heapqmodule.c
@@ -186,7 +186,8 @@
This is more efficient than heappop() followed by heappush(), and can be\n\
more appropriate when using a fixed-size heap. Note that the value\n\
returned may be larger than item! That constrains reasonable uses of\n\
-this routine.\n");
+this routine unless written as part of a larger expression:\n\n\
+ result = item <= heap[0] and item or heapreplace(heap, item)\n");
static PyObject *
heapify(PyObject *self, PyObject *heap)