Added JSDoc to ESLint (#3529)

* Added JSDoc to eslint rules

Signed-off-by: Matthew Nickson <mnickson@sidingsmedia.com>

* Fixed JSDoc eslint errors

Signed-off-by: Matthew Nickson <mnickson@sidingsmedia.com>

* Update the check-linters workflow to Node.js 20

---------

Signed-off-by: Matthew Nickson <mnickson@sidingsmedia.com>
Co-authored-by: Louis Lam <louislam@users.noreply.github.com>

src/components/settings/Notifications.vue

@@ -81,6 +81,7 @@ export default {
         /**
          * Remove a day from expiry notification days.
          * @param {number} day The day to remove.
+         * @returns {void}
          */
         removeExpiryNotifDay(day) {
             this.settings.tlsExpiryNotifyDays = this.settings.tlsExpiryNotifyDays.filter(d => d !== day);
@@ -93,6 +94,7 @@ export default {
          * - day is > 0.
          * - The day is not already in the list.
          * @param {number} day The day number to add.
+         * @returns {void}
          */
         addExpiryNotifDay(day) {
             if (day != null && day !== "") {