Documentation/git svn log: add a note about timezones.

git svn log mimics the timezone converting behaviour of svn log, but
this was undocumented.

Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-svn.txt

@@ -159,6 +159,10 @@ New features:
 	our version of --pretty=oneline
 --
 +
+NOTE: SVN itself only stores times in UTC and nothing else. The regular svn
+client converts the UTC time to the local time (or based on the TZ=
+environment). This command has the same behaviour.
++
 Any other arguments are passed directly to `git log'
 
 --