Removed unused doc reference
diff --git a/docs/hazmat/primitives/asymmetric/serialization.rst b/docs/hazmat/primitives/asymmetric/serialization.rst
index ac3080c..2b3eb51 100644
--- a/docs/hazmat/primitives/asymmetric/serialization.rst
+++ b/docs/hazmat/primitives/asymmetric/serialization.rst
@@ -98,6 +98,3 @@
:raises UnsupportedAlgorithm: If the serialized key is of a type that
is not supported by the backend or if the key is encrypted with a
symmetric cipher that is not supported by the backend.
-
-
-.. _`X.501`: en.wikipedia.org/wiki/X.500