Requests updated guild roster information from the server.
- GUILD_ROSTER_UPDATE fires when updated (but not necessarily altered) information is received from the server.
- The call will be ignored completely if the last GuildRoster() call was less than 10 seconds ago (most likely to limit the traffic caused by frequent opening/closing of the guild tab).
- Patch 8.2.0 / API (2019-06-25): Moved to C_GuildInfo.GuildRoster. The previous alias is deprecated. 
- Patch 1.1.0 / API (2004-11-07): Added as GuildRoster.