Instructions for setting Environment variable

Line 2 of this file instructs the user to set an environment variable in their filebrowser container, but supplies an incorrect name for that variable.

Filebrowser expects environment variables to be prepended with FB_ as per https://filebrowser.org/cli/filebrowser#options and as mentioned by one of the filebrowser contributors over at filebrowser/filebrowser#1557 (comment)

Author: coreyaboy

filebrowser.subfolder.conf.sample

@@ -1,5 +1,5 @@
 ## Version 2022/09/08
-# set this environment variable on your filebrowser container FILEBROWSER_BASEURL=/filebrowser
+# set this environment variable on your filebrowser container FB_BASEURL=/filebrowser
 
 location /filebrowser {
     return 301 $scheme://$host/filebrowser/;