ch09: Document new-to-1.8 SVNUseUTF8 mod_dav_svn directive

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Subversion 1.8 introduces the 'SVNUseUTF8' mod_dav_svn directive for telling 
Subversion to use a UTF8 locale for hook script invocations and such.  See 
r1239203 in the ASF repository for details.

Neels Hofmeyer kicked off an attempt at documenting this for the book, but it 
spawned a thread whose conclusion evades me.
http://www.red-bean.com/pipermail/svnbook-dev/2012-February/006663.html
(Perhaps I can piece together a would-be final patch from the last patch in the 
thread plus the followup review comments of Stefan Sperling?)

Original issue reported on code.google.com by cmpilato on 16 Jan 2013 at 3:49

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Original comment by cmpilato on 16 Jan 2013 at 3:49

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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Finished in r4326.

Original comment by cmpilato on 16 Jan 2013 at 7:11

• Changed state: Fixed