Merge pull request #3684 from bbock/docs-remove-p3p

Docs: Remove obsolete P3P policy

docs/installation/3-http-daemon.md

@@ -32,7 +32,6 @@ server {
         proxy_set_header X-Forwarded-Host $server_name;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-Proto $scheme;
-        add_header P3P 'CP="ALL DSP COR PSAa PSDa OUR NOR ONL UNI COM NAV"';
     }
 }
 ```