control/noise: fix typo in docstring.
@@ -318,7 +318,7 @@ func (s *symmetricState) DecryptAndHash(plaintext, ciphertext []byte) error {
return nil
}
-// Split returns two ChaCha20Poly1305 ciphers with keys derives from
+// Split returns two ChaCha20Poly1305 ciphers with keys derived from
// the current handshake state. Methods on s must not be used again
// after calling Split().
func (s *symmetricState) Split() (c1, c2 cipher.AEAD, err error) {
