SSL_CTX_set_keylog_callback: copy-paste error _set_ -> _get_

tweak previous: properly mark up function pointer typedef
plus .Dv NULL, SEE ALSO, HISTORY

Add SSL_CTX_set_keylog_callback and SSL_CTX_get_keylog_callback

Some things in ports care about calling these functions. Since we will
not provide private key logging functionality they are document

Add SSL_CTX_set_keylog_callback and SSL_CTX_get_keylog_callback

Some things in ports care about calling these functions. Since we will
not provide private key logging functionality they are documented
as being for compatibility and that they don't do anything.

ok tb@

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