Update lib/filters/core-filters.js

Use nunjucks formatting in the example

Co-authored-by: Colin Rotherham <[email protected]>

lib/filters/core-filters.js

@@ -18,20 +18,23 @@ runWhenEnvIsAvailable(() => {
    * Returns an array of objects for use in a macro that requires a list of items
    * @param  {String[]} an array of strings.
    * @return {Object[]} an array of objects with each object containing text and value properties.
-   * @example {{ govukCheckboxes({
-   *             name: "waste",
-   *             fieldset: {
-   *               legend: {
-   *                 text: "Which types of waste do you transport?",
-   *                 isPageHeading: true,
-   *                 classes: "govuk-fieldset__legend--l"
-   *               }
-   *             },
-   *             hint: {
-   *               text: "Select all that apply."
-   *             },
-   *             items: ['Rubble', 'Oil', 'Card'] | formatItems
-   *           }) }}
+   * @example
+   * ```njk
+   * {{ govukCheckboxes({
+   *   name: "waste",
+   *   fieldset: {
+   *     legend: {
+   *       text: "Which types of waste do you transport?",
+   *       isPageHeading: true,
+   *       classes: "govuk-fieldset__legend--l"
+   *     }
+   *   },
+   *   hint: {
+   *     text: "Select all that apply."
+   *   },
+   *   items: ["Rubble", "Oil", "Card"] | formatItems
+   * }) }}
+   * ```
    */
   addFilter('formatItems', (items = []) => Array.isArray(items) ? items.map(item => ({ text: item, value: item })) : [])
 })