Tell the user that isohybrid modifies the ISO image

At least on “Manual installation using Linux”, we tell users to run isohybrid on a Tails ISO image. So far, so good.

This modifies the ISO image, which is a problem if one tries to later verify its OpenPGP signature, or to share it e.g. via BitTorrent.

How about quickly telling the user that isohybrid modifies the ISO image? Most users won’t draw conclusions out of it (and they probably should not anyway), but those who have the skills to do more advanced things with it will be hinted that they should first backup the ISO file.

OTOH, mentioning this would make the installation doc more complex, which might not be worth it. What do others think?

Feature Branch: doc/7370-isohybrid-modifies-iso

Related issues

Related to #7462 (closed)

Original created by @intrigeri on 7370 (Redmine)

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