fix: update clickjacking protection example
As mentioned in #1006921 and documented on https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options X-Frame-Options is obsolete and has been replaced by CSP’s frame-ancestor directive.
As mentioned in #1006921 and documented on https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options X-Frame-Options is obsolete and has been replaced by CSP’s frame-ancestor directive.