Fixes nginx match rule, containing wrong chars.

Also adds a missing '/'.

doc/debian/jitsi-meet/jitsi-meet.example

         proxy_set_header Host $http_host;
     }
 
-    location ~ ^/([^?&:’“]+)$ {
+    location ~ ^/([^/?&:'"]+)$ {
         try_files $uri @root_path;
     }