doc: Get rid of unrelated reference to DSA_new()

CLA: trivial
Signed-off-by: NJakub Jelen <jjelen@redhat.com>
Reviewed-by: NPaul Yang <yang.yang@baishancloud.com>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8786)

doc/man3/ECDSA_SIG_new.pod

@@ -200,7 +200,7 @@ ANSI X9.62, US Federal Information Processing Standard FIPS 186-2
 
 =head1 SEE ALSO
 
-L<DSA_new(3)>,
+L<EC_KEY_new(3)>,
 L<EVP_DigestSignInit(3)>,
 L<EVP_DigestVerifyInit(3)>