New sentence, new line.

Minor updates - I've attempted to catch the most glaringly outdated
statements but haven't made any effort yet to rewrite the main content.

branches: 1.1.2; 1.1.34; 1.1.46;
Import the config documentation from FreeBSD into the smm. Rather than
name the directory "02.config" as it historically was, name it config, so
that if we ever want to update this book for the modern age, we can move
chapters around, delete them, etc, without mass confusion.