Version Control With Subversion Source

* src/en/book/ch09-reference.xml
(svn.ref.svnlook.c.info): Note that the size of the log message is expressed
in bytes, and that the log message is always followed by a newline. Fix
the example to actually show the correct log size. (Doh!)
(svn.ref.svnlook.c.log): Note that the log message is always followed by a
newline.

Suggested by: Vincent Lefevre <vincent+svn@...>