Fix header on browser certificates page

Author: tashian

tutorials/browser-certificate-setup-guide.mdx

@@ -1,11 +1,11 @@
 ---
 title: Configure Web Browser Certificates
-updated_at: April 09, 2025
+updated_at: April 10, 2025
 html_title: Configure your web browsers to use Smallstep hardware-bound device identtiy certificates.
 description: This tutorial describes how to set up web browsers to access resources using mutual TLS and Smallstep certificates.
 ---
 
-## Before we begin
+## Introduction
 
 Certificate-based authentication in web browsers
 offers excellent security characteristics, thanks to mutual TLS.