git-svn: document the 'git svn propset' command

Add example usage to the git-svn documentation.

Reported-by: Joseph Pecoraro <pecoraro@apple.com>
Signed-off-by: Alfred Perlstein <alfred@freebsd.org>
Reviewed-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/git-svn.txt b/Documentation/git-svn.txt
index 39e9a18..909e9ee 100644
--- a/Documentation/git-svn.txt
+++ b/Documentation/git-svn.txt
@@ -456,6 +456,20 @@
 	Gets the Subversion property given as the first argument, for a
 	file.  A specific revision can be specified with -r/--revision.
 
+'propset'::
+	Sets the Subversion property given as the first argument, to the
+	value given as the second argument for the file given as the
+	third argument.
++
+Example:
++
+------------------------------------------------------------------------
+git svn propset svn:keywords "FreeBSD=%H" devel/py-tipper/Makefile
+------------------------------------------------------------------------
++
+This will set the property 'svn:keywords' to 'FreeBSD=%H' for the file
+'devel/py-tipper/Makefile'.
+
 'show-externals'::
 	Shows the Subversion externals.  Use -r/--revision to specify a
 	specific revision.