Update to r47273:
Update installation chapter references, and remove references to the
install chapter covering 8.x.

Update to r47233:
Be consistent about the blocksize (1m instead of 64k)
with the instructions in the release notes when describing how to
burn the memstick image to a memory stick.

Update to r46774:
Update link to the Plop boot manager.

Update to r46402:
Minimum Hardware Requirements: hardware requirements
Point people directly to the website and skip having people check for
HARDWARE.txt on media they likely haven't downloaded yet.

Update to r45127:
Remove dash from example partition label and clarify wording. A dash
can be used in a partition label, but not in a UFS label. Even though
users are told not to use identical labels, we can remove one source
of potential confusion by sticking to the lowest common denominator.