simplify entity declaration in books and articles

[Hiroki Sato]

"Simon L. Nielsen" <simon at FreeBSD.org> wrote
  in <20040807174313.GB684 at arthur.nitro.dk>:

simon> Patching file ja_JP.eucJP/articles/fbsd-from-scratch/article.sgml
simon> using Plan A...  Hunk #1 failed at 1.

 Hmm, Japanese encoding used in the patch is automatically
 converted into another one when I sent that.  The attached
 one should work.

-- 
| Hiroki SATO
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