Update link to MS docs (#4632)
diff --git a/docs/hazmat/backends/openssl.rst b/docs/hazmat/backends/openssl.rst
index 805a85f..52aeeaf 100644
--- a/docs/hazmat/backends/openssl.rst
+++ b/docs/hazmat/backends/openssl.rst
@@ -123,4 +123,4 @@
.. _`initializing the RNG`: https://en.wikipedia.org/wiki/OpenSSL#Predictable_private_keys_.28Debian-specific.29
.. _`Fortuna`: https://en.wikipedia.org/wiki/Fortuna_(PRNG)
.. _`Yarrow`: https://en.wikipedia.org/wiki/Yarrow_algorithm
-.. _`Microsoft documentation`: https://msdn.microsoft.com/en-us/library/windows/desktop/aa379942(v=vs.85).aspx
+.. _`Microsoft documentation`: https://docs.microsoft.com/en-us/windows/desktop/api/wincrypt/nf-wincrypt-cryptgenrandom
