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formatting. Patch by Julian "Foad is in the Details" Foad
<julianfoad@...>.

* doc/book/book/ch06.xml
Fix some formatting: use of "<option>".

* doc/book/book/ch08.xml
Add missing entries in the "svn Switches" section.
Fix some formatting, including missing white space.
Fix some text: "Addition"->"Deletion", a misplaced ")", etc.