add ed448 test vectors (#4608)

diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index a3ffc9a..10a15b2 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -50,6 +50,7 @@
   Ruby test suite.
 * X25519 and X448 test vectors from :rfc:`7748`.
 * RSA OAEP with custom label from the `BoringSSL evp tests`_.
+* Ed448 test vectors from :rfc:`8032`.
 
 
 Custom asymmetric vectors