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

Change-Id: Iba95a07bb1ed6230b9a900448bf294355a58285c
diff --git a/config-models/aether-3.x/files/yang/traffic-class.yang b/config-models/aether-3.x/files/yang/traffic-class.yang
index 636c816..ce9aeb5 100755
--- a/config-models/aether-3.x/files/yang/traffic-class.yang
+++ b/config-models/aether-3.x/files/yang/traffic-class.yang
@@ -11,7 +11,7 @@
 
   organization "Open Networking Foundation.";
   contact "Scott Baker";
-  description 
+  description
     "The aether traffic class associates qos constants
      with a named class of service";
 
@@ -24,6 +24,7 @@
         type yg:yang-identifier {
             length 1..32;
         }
+    description "The typedef for traffic-class-id";
   }
 
   container traffic-class {
@@ -54,17 +55,17 @@
       leaf pdb {
         type at:pdb;
         description "PDB";
-      }        
+      }
 
       leaf qci {
         type at:qci;
         description "QCI";
-      }      
+      }
 
       leaf description {
         type at:description;
         description "description of this traffic class";
       }
     }
-  } 
+  }
 }