message: [Trivial] Document logtimemicros flag in the help
diff: @@ -507,6 +507,7 @@ std::string HelpMessage(HelpMessageMode mode)
  strUsage += HelpMessageOpt("-help-debug", _("Show all debugging options (usage: --help -help-debug)"));
  strUsage += HelpMessageOpt("-logips", strprintf(_("Include IP addresses in debug output (default: %u)"), 0));
  strUsage += HelpMessageOpt("-logtimestamps", strprintf(_("Prepend debug output with timestamp (default: %u)"), 1));
  + strUsage += HelpMessageOpt("-logtimemicros", strprintf("Add microsecond precision to debug timestamps (default: %u)", DEFAULT_LOGTIMEMICROS));
  if (GetBoolArg("-help-debug", false)) {
  strUsage += HelpMessageOpt("-limitfreerelay=<n>", strprintf(_("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default:%u)"), 15));
  strUsage += HelpMessageOpt("-relaypriority", strprintf(_("Require high priority for relaying free or low-fee transactions (default:%u)"), 1));
  