Update tools/eslint-rules/avoid-prototype-pollution.js

Co-authored-by: Livia Medeiros <[email protected]>

Author: aduh95

tools/eslint-rules/avoid-prototype-pollution.js

@@ -101,7 +101,7 @@ module.exports = {
         }
         context.report({
           node,
-          message: 'Proxy handler must be null-prototype objects'
+          message: 'Proxy handler must be a null-prototype object'
         });
       }
     };