feat: add docs link to e invoice settings

erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.js

@@ -1,4 +1,11 @@
 // Copyright (c) 2020, Frappe Technologies Pvt. Ltd. and contributors
 // For license information, please see license.txt
 
-frappe.ui.form.on('E Invoice Settings', {});
+frappe.ui.form.on('E Invoice Settings', {
+	refresh(frm) {
+		const docs_link = 'https://docs.erpnext.com/docs/user/manual/en/regional/india/setup-e-invoicing';
+		frm.dashboard.set_headline(
+			__("Read {0} for more information on E Invoicing features.", [`<a href='${docs_link}'>documentation</a>`])
+		);
+	}
+});