Fix --walk-reflog with --pretty=oneline

Now, "git log --abbrev-commit --pretty=o --walk-reflogs HEAD" is
reasonably pleasant to use.

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/Documentation/git-rev-list.txt b/Documentation/git-rev-list.txt
index fcc540b..a996f6c 100644
--- a/Documentation/git-rev-list.txt
+++ b/Documentation/git-rev-list.txt
@@ -27,6 +27,7 @@
 	     [ \--pretty | \--header ]
 	     [ \--bisect ]
 	     [ \--merge ]
+	     [ \--walk-reflogs ]
 	     <commit>... [ \-- <paths>... ]
 
 DESCRIPTION
@@ -203,7 +204,8 @@
 taken from the reflog.  By default, 'commit@{Nth}' notation is
 used in the output.  When the starting commit is specified as
 'commit@{now}', output also uses 'commit@{timestamp}' notation
-instead.
+instead.  Under '\--pretty=oneline', the commit message is
+prefixed with this information on the same line.
 
 --merge::