[SW Update] update fwupdate host script help
[SW Update] update fwupdate host script help

Resolves: LE-6390
Change-Id: Iad9149e4ff6bf9ee9bc994cc3b3febd02b072f4c

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af