comment fix

Author: link2xt

src/mimefactory.rs

@@ -87,7 +87,7 @@ pub struct MimeFactory {
     /// e.g. if members are hidden for broadcast lists.
     to: Vec<(String, String)>,
 
-    /// Vector of pairs of past group member name and addresses.
+    /// Vector of pairs of past group member names and addresses.
     past_members: Vec<(String, String)>,
 
     /// Timestamps of the members in the same order as in the `recipients`