Generates the mention syntax for a group mention.
@"Name Plural"#gGroupID
// '@"Mods"#g4'forGroup(group) // Group display name is 'Mods', group ID is 4 Copy
// '@"Mods"#g4'forGroup(group) // Group display name is 'Mods', group ID is 4
All groups are already loaded, so we don't need to search for them.
Generates the mention syntax for a group mention.
@"Name Plural"#gGroupID