Bug#501175: [installation-guide] 6.2: please improve iso-scan component description

[Filipus Klutiero <chealer@gmail.com>]

Package: installation-guide
Severity: wishlist
Tags: patch

In section 6.2, iso-scan is described as

Looks for ISO file systems, which may be on a CD-ROM or on the hard drive.

This sounded to me as if iso-scan would only look on the [primary] hard drive, 
but it looks on any hard drive (including external hard drives connected via 
USB). Also, there should be no distinction between CD-ROM-s and other optical 
disks. So I suggest

Looks for ISO images, which may be on an optical disk or on a hard drive.