Documentation: minor grammatical fix in rev-list-options.txt

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index 7e7ba68..62340a5 100644
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -272,7 +272,7 @@
 
 --full-history::
 
-	As the default mode but does not prune some history.
+	Same as the default mode, but does not prune some history.
 
 --dense::