message: Improve !help message
  Add the missing server argument to the help message for !whois, and make this
  argument consistent across all command help messages.
  (The change from irc.example.com to irc.example.net is simply because that is a
  more common top-level-domain for IRC networks, and it reads almost as "example
  net".)
diff: @@ -203,33 +203,33 @@ MatrixHandler.prototype._onAdminMessage = Promise.coroutine(function*(req, event
  if (cmd === "!help") {
  let helpCommands = {
  "!join": {
  - example: `!join irc.example.com #channel [key]`,
  + example: `!join [irc.example.net] #channel [key]`,
  summary: `Join a channel (with optional channel key)`,
  },
  "!nick": {
  - example: `!nick irc.example.com DesiredNick`,
  + example: `!nick [irc.example.net] DesiredNick`,
  summary: "Change your nick. If no arguments are supplied, " +
  "your current nick is shown.",
  },
  "!whois": {
  - example: `!whois NickName|@alice:matrix.org`,
  + example: `!whois [irc.example.net] NickName|@alice:matrix.org`,
  summary: "Do a /whois lookup. If a Matrix User ID is supplied, " +
  "return information about that user's IRC connection.",
  },
  "!storepass": {
  - example: `!storepass [irc.example.com] passw0rd`,
  + example: `!storepass [irc.example.net] passw0rd`,
  summary: `Store a NickServ password (server password)`,
  },
  "!removepass": {
  - example: `!removepass [irc.example.com]`,
  + example: `!removepass [irc.example.net]`,
  summary: `Remove a previously stored NickServ password`,
  },
  "!quit": {
  example: `!quit`,
  - summary: `Leave all bridged channels and remove your connection to IRC`,
  + summary: `Leave all bridged channels, on all networks, and remove your connections to all networks.`,
  },
  "!cmd": {
  - example: `!cmd [irc.server] COMMAND [arg0 [arg1 [...]]]`,
  + example: `!cmd [irc.example.net] COMMAND [arg0 [arg1 [...]]]`,
  summary: `Issue a raw IRC command. These will not produce a reply.`,
  },
  };
  