[IMPROVE] Make Livechat Instructions setting multiline (#23515)

app/livechat/server/config.ts

@@ -88,6 +88,7 @@ Meteor.startup(function() {
 			section: 'Livechat',
 			i18nLabel: 'Instructions',
 			i18nDescription: 'Instructions_to_your_visitor_fill_the_form_to_send_a_message',
+			multiline: true,
 		});
 		this.add('Livechat_offline_email', '', {
 			type: 'string',