Add documentation to eth modules.

docs/compodoc/classes/HttpError.html

@@ -269,6 +269,11 @@ export class GlobalErrorHandler extends ErrorHandler {
     }
   }
 
+  /**
+   *
+   * @param errorTraceString
+   * @private
+   */
   private isWarning(errorTraceString: string): boolean {
     let isWarning: boolean = true;
     if (errorTraceString.includes('/src/app/')) {