refactor: add 'mode' property in second array object in examples (#5086)

Author: ayushkumarbhadani

Diff for: examples/general/config-array/webpack.config.js

@@ -34,6 +34,7 @@ module.exports = [
     output: {
       filename: "bundle2.js",
     },
+    mode: "development",
     module: {
       rules: [
         {