Add a comment to clarify the ban expires field.

crates/api_common/src/community.rs

@@ -97,6 +97,7 @@ pub struct BanFromCommunity {
   pub ban: bool,
   pub remove_data: Option<bool>,
   pub reason: Option<String>,
+  /// A time that the ban will expire, in unix epoch seconds.
   pub expires: Option<i64>,
 }
 

crates/api_common/src/person.rs

@@ -214,6 +214,7 @@ pub struct BanPerson {
   /// Optionally remove all their data. Useful for new troll accounts.
   pub remove_data: Option<bool>,
   pub reason: Option<String>,
+  /// A time that the ban will expire, in unix epoch seconds.
   pub expires: Option<i64>,
 }