nistp521: add a comment to the P+P exceptional case in point_add.
This change adds a comment to the exceptional case in point_add that handles the case of a doubling, which explains when this case may occur during normal processing. Thanks go to Antonio Sanso for noting this. Reviewed-by:Emilia Käsper <emilia@openssl.org> Reviewed-by:
Andy Polyakov <appro@openssl.org> Reviewed-by:
Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4424)
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