message: [docs] modify responsible disclosure email
  Quick update on the responsible disclosure email.
diff: @@ -4,6 +4,6 @@ If you believe you have found a security vulnerability in Vercel, we encourage y
  We will investigate all legitimate reports and do our best to quickly fix the problem.
  -Please email `security@vercel.com` to disclose any security vulnerabilities.
  +Please email `responsible.disclosure@vercel.com` to disclose any security vulnerabilities.
  https://vercel.com/security
  