added-yang-linter-and-resolved-all-error-produced-by it

Change-Id: Iba95a07bb1ed6230b9a900448bf294355a58285c
diff --git a/config-models/aether-2.1.x/files/yang/apn-profile.yang b/config-models/aether-2.1.x/files/yang/apn-profile.yang
index 27361dc..8445cc8 100755
--- a/config-models/aether-2.1.x/files/yang/apn-profile.yang
+++ b/config-models/aether-2.1.x/files/yang/apn-profile.yang
@@ -21,12 +21,13 @@
   }
 
   // TODO: Think more on whether this should be a UUID or
-  // simply a unique name. If it's a UUID, could fix the 
+  // simply a unique name. If it's a UUID, could fix the
   // string length.
   typedef apn-profile-id {
         type string {
             length 1..32;
         }
+    description "The typedef for apn-profile-id";
   }
 
   container apn-profile {
@@ -47,7 +48,7 @@
             length 1..80;
         }
         description "display name to use in GUI or CLI";
-      }     
+      }
 
       leaf apn-name {
         type string {
@@ -96,5 +97,5 @@
           "Link to service group";
       }
     }
-  } 
+  }
 }