Various fixes for the SGML docs. Consistently use spaces before/after

Neil Conway <neilc@samurai.com>

Commit: 79ba540b78c69b9d91214899283a843ce40c52d5
Author: Neil Conway <neilc@samurai.com>
Date: 2007-05-15T19:13:55Z
Releases: 8.3.0
Various fixes for the SGML docs. Consistently use spaces before/after
parentheses in syntax descriptions. Consistently use the present tense
when describing the basic purpose of each "DROP" command. Add a few
more hyperlinks.

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