Remove hint for `--cleanuplegacyfadersettings`

[ann0see]

URL
All installation pages.

We just need to empty: https://github.com/jamulussoftware/jamuluswebsite/blob/next-release/_includes/infobox_each_os.html

[pljones]

Ah yes... now you mention it, I do vaguely remember this being added.