incremental vs. full backup section of chapter 5 to avoid confusion.
Patch from Blake Nicholson <svn_at_seraphinandblake.com>, with a minor tweak.
* doc/book/book/ch01.xml (svn-ch-1-sect-3): Removed extraneous 'a'.
* doc/book/book/ch04.xml (svn-ch-4-sect-3.1): Fixed chapter reference for
svn diff and svn merge syntax.
* doc/book/book/ch05.xml (svn-ch-5-sect-3.6): Changed the text
'...full repository dump...' to '...complete repository dump...' to avoid
any confusion with full vs. incremental backups, being discussed in the
same section.
* doc/book/book/ch08.xml (svn-ch-8-sect-1.1): Grammar fix.
