Patch from Chris Larson (kergoth), to allow multiple directores to be
unmounted at once.
diff --git a/docs/busybox.sgml b/docs/busybox.sgml
index b54d68e..bd8b169 100644
--- a/docs/busybox.sgml
+++ b/docs/busybox.sgml
@@ -3441,7 +3441,7 @@
 	    <title>umount</title>
 
 		<para>
-		Usage: umount [OPTION]... DEVICE|DIRECTORY
+		Usage: umount [OPTION]... DEVICE|DIRECTORY [...]
 		</para>
 
 		<para>