Version Control With Subversion Source

* en/book/ch03-advanced-topics.xml
(svn.advanced.pegrevs): Remove a stray character recently added.
(svn.advanced.props): Minor tweaks.
(svn.advanced.sparsedirs, svn.advanced.externals): Tweak wording to
not imply that 1.6 is the "current" offering.
(svn.advanced.locking.creation): Update 'svn info' output to
include 'Repository Root' and 'Working Copy Root Path' items.
(svn.advanced.locking.discovery): Update 'svn info' output to
include 'Repository Root' item.