update the inline documentation strings

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

src/models/user_roles.rs

@@ -1,23 +1,28 @@
 /*
  * advotracker - Hotline tackingtool for Advocats
  *
- * Copyright 2019 Ralf Zerres <ralf.zerres@networkx.de>
+ * Copyright 2020 Ralf Zerres <ralf.zerres@networkx.de>
  * SPDX-License-Identifier: (0BSD or MIT)
  */
 
 use crate::schema::user_roles;
 use serde_derive::*;
 
+/// Structure of a user role record
 #[derive(Debug, Queryable, PartialEq)]
 pub struct UserRole {
+    /// id of the referenced user
     pub id_user: i32,
+    /// id of the referenced role
     pub id_role: i32,
 }
 
-//#[derive(Deserialize)]
+/// Structure of a new user role record
 #[derive(Deserialize, Insertable)]
 #[table_name = "user_roles"]
 pub struct NewUserRole {
+    /// id of the referenced user
     pub id_user: i32,
+    /// id of the referenced role
     pub id_role: i32,
 }