Version Control With Subversion Source

* src/en/book/ch03-advanced-topics.xml
(svn.advanced.sparsedirs): Document the new --set-depth exclude
option, and provide an example of its use.

* src/en/book/ch09-reference.xml
(svn.ref.svn.sw): Note the 'exclude' value for --set-depth.
(svn.ref.svn.c.switch, svn.ref.svn.c.update): Remove the note about
not being able to de-telescope a working copy.