Update check_quorum comment to remove 3-member requirement
The corresponding code change was
@@ -807,8 +807,7 @@ impl Server {
/// Check if a given service group has quorum to run an election.
///
- /// A given group has quorum if, from this servers perspective, it has an alive population that
- /// is over 50%, and at least 3 members.
+ /// A group has quorum if a majority of its non-departed members are alive.
fn check_quorum(&self, key: &str) -> bool {
let electorate = self.get_electorate(key);
let service_group_members = self.get_total_population(key);
