[PATCH FOR REVIEW] doc/en_US.ISO8859-1/books SGML cleanup

[Xin LI]

Dear folks,

Recently one of our localization team member (intron@) has pointed
out to me that we have some unescaped >, <, and &'s found in the
SGML source.  After some discussion we think that these changes
should be propagated back to the English version of these files
as well.

Does the patch located at:

	http://people.freebsd.org/~delphij/for_review/patch-books

Look appropriate?  The primary change is to escape >, <, and &, plus
adding some "'s for attributes.

Thanks for advance!

Cheers,