Apache servedFiles: fixed a typo in example

Changed files
+1 -1
nixos
modules
services
web-servers
apache-httpd
+1 -1
nixos/modules/services/web-servers/apache-httpd/per-server-options.nix
···
default = [];
example = [
{ urlPath = "/foo/bar.png";
-
dir = "/home/eelco/some-file.png";
+
files = "/home/eelco/some-file.png";
}
];
description = ''