usermanual: Aesthetic fix in chapter 1.
usermanual: Aesthetic fix in chapter 1.

A simple tidy of a comma-separated list in Chapter 1.

Signed-off-by: Robert P. J. Day <01aa5cd9a29907856ec6ddeebcb643ede4c45b8b@crashcourse.ca>
Acked-by: Holger Hans Peter Freyther <100e68ee9b4821ba21791f94c53e61236ff440a4@selfish.org>

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