Fix referenses in section 3 manuals

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1900)

doc/man3/SSL_get_shared_sigalgs.pod

diff --git a/doc/man3/SSL_get_shared_sigalgs.pod b/doc/man3/SSL_get_shared_sigalgs.pod
index 6a70e90..1309882 100644
--- a/doc/man3/SSL_get_shared_sigalgs.pod
+++ b/doc/man3/SSL_get_shared_sigalgs.pod
@@ -72,7 +72,7 @@
 =head1 SEE ALSO
 
 L<SSL_CTX_set_cert_cb(3)>,
-L<ssl(3)>
+L<ssl(7)>
 
 =head1 COPYRIGHT