Update heartbleedmitigation.md - ciphers cmd, faq
Update heartbleedmitigation.md - ciphers cmd, faq

added suggested command to provide additional detail:
openssl ciphers -v
added faq for openssl relating to current openssl version and additional details:
https://www.openssl.org/support/faq.html
btcfoundationedcom/btcfoundationedcom.github.io,btcfoundationedcom/btcfoundationedcom.github.io,btcfoundationedcom/btcfoundationedcom.github.io