feat: Adds a hint for cors headers in default prosody config.

doc/debian/jitsi-meet-prosody/prosody.cfg.lua-jvb.example

@@ -14,6 +14,16 @@ cross_domain_bosh = false;
 consider_bosh_secure = true;
 -- https_ports = { }; -- Remove this line to prevent listening on port 5284
 
+-- by default prosody 0.12 sends cors headers, if you want to disable it uncomment the following (the config is available on 0.12.1)
+--http_cors_override = {
+--    bosh = {
+--        enabled = false;
+--    };
+--    websocket = {
+--        enabled = false;
+--    };
+--}
+
 -- https://ssl-config.mozilla.org/#server=haproxy&version=2.1&config=intermediate&openssl=1.1.0g&guideline=5.4
 ssl = {
     protocol = "tlsv1_2+";