spec: Update dir-spec.txt with HS v3 consensus param
We have a series of consensus param in the HS v3 subsystem that needs to be documented in the dir-spec.txt namely: - hs_intro_min_introduce2 - hs_intro_max_introduce2 - hs_intro_min_lifetime - hs_intro_max_lifetime - hs_intro_num_extra - hsdir_n_replicas - hsdir_spread_fetch - hsdir_spread_store - hsdir-interval Probably that last one we want to change it to `hsdir_interval` (in the code as well) so we follow the proper syntax of using underscore.
issue