clean up loader and make docs default to hmac sha256
diff --git a/docs/hazmat/primitives/hmac.rst b/docs/hazmat/primitives/hmac.rst
index 993e317..47b8803 100644
--- a/docs/hazmat/primitives/hmac.rst
+++ b/docs/hazmat/primitives/hmac.rst
@@ -27,7 +27,7 @@
     .. doctest::
 
         >>> from cryptography.primitives import hashes, hmac
-        >>> h = hmac.HMAC(key, hashes.SHA1)
+        >>> h = hmac.HMAC(key, hashes.SHA256)
         >>> h.update(b"message to hash")
         >>> h.hexdigest()
         '...'