Update serverinfo documentation based on feedback received

length bytes of extension_data. The context and type values have the same

meaning as for L<SSL_CTX_add_custom_ext(3)>. If serverinfo is being loaded for

extensions to be added to a Certificate message, then the extension will only

be added for the first Certificate in the message.

be added for the first certificate in the message (which is always the

end-entity certificate).

If B<version> is B<SSL_SERVERINFOV1> then the extensions in the array must

consist of a 2-byte Extension Type, a 2-byte length, and then length bytes of

loaded serverinfo extension data will be loaded for that certificate.  To

use the serverinfo extension for multiple certificates,

SSL_CTX_use_serverinfo() needs to be called multiple times, once B<after>

each time a certificate is loaded.

each time a certificate is loaded via a call to SSL_CTX_use_certificate().

=head1 RETURN VALUES