Cleanup documentation for removed functionality

Remove some lingering references to removed functionality from docs.
Reviewed-by: NStephen Henson <steve@openssl.org>

doc/ssl/SSL_CTX_set_tmp_dh_callback.pod

@@ -122,7 +122,6 @@ on failure. Check the error queue to find out the reason of failure.
 =head1 SEE ALSO
 
 L<ssl(3)>, L<SSL_CTX_set_cipher_list(3)>,
-L<SSL_CTX_set_tmp_rsa_callback(3)>,
 L<SSL_CTX_set_options(3)>,
 L<ciphers(1)>, L<dhparam(1)>
 

doc/ssl/ssl.pod

@@ -270,8 +270,6 @@ protocol context defined in the B<SSL_CTX> structure.
 
 =item int B<SSL_CTX_load_verify_locations>(SSL_CTX *ctx, const char *CAfile, const char *CApath);
 
-=item long B<SSL_CTX_need_tmp_RSA>(SSL_CTX *ctx);
-
 =item SSL_CTX *B<SSL_CTX_new>(const SSL_METHOD *meth);
 
 =item int SSL_CTX_up_ref(SSL_CTX *ctx);