Timing attack page describes non-existing function

[eproxus]

The page https://github.com/erlef/security-wg/blob/master/docs/secure_coding_and_deployment_hardening/timing_attacks.md describes a function crypto:equal_const_time/2 which is not documented. It seems an official API has been added in erlang/otp#4750 called crypto:hash_equals/2 which should probably be recommended instead?

[voltone]

At the time we were working on this there were some heated arguments (in erlang/otp#2749 and erlang/otp#4750) about this function. We neglected to update the document with the final name. Thanks for the heads-up, I proposed a fix.