Missing diff in cover leter for v2 patch attached below.

> This patch series applies your suggestions.  Also it's rebased on
> origin/master and added a missing documentation for ‘docker-layered’ format in
> ‘guix system image’ command in doc/guix.texi file (following diff).

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diff --git a/doc/guix.texi b/doc/guix.texi
index bd0ee126ee..6938743154 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -43306,6 +43306,8 @@ one or multiple partitions.
 
 @item @code{docker}, a Docker image.
 
+@item @code{docker-layered}, a layered Docker image.
+
 @item @code{iso9660}, an ISO-9660 image.
 
 @item @code{tarball}, a tar.gz image archive.
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