Attempt to link to the os.urandom docs from upstream

docs/random-numbers.rst

diff --git a/docs/random-numbers.rst b/docs/random-numbers.rst
index 5113afd..8b119a3 100644
--- a/docs/random-numbers.rst
+++ b/docs/random-numbers.rst
@@ -9,9 +9,9 @@
 major security issues depending on the algorithms in use.
 
 Therefore, it is our recommendation to `always use your operating system's
-provided random number generator`_, which is available as ``os.urandom()``. For
-example, if you need 16 bytes of random data for an initialization vector, you
-can obtain them with:
+provided random number generator`_, which is available as :func:`os.urandom`.
+For example, if you need 16 bytes of random data for an initialization vector,
+you can obtain them with:
 
 .. doctest::