docs: fix mailing list

Fix the mailing list since it's way out of date.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
diff --git a/design/XFS_Filesystem_Structure/xfs_filesystem_structure.asciidoc b/design/XFS_Filesystem_Structure/xfs_filesystem_structure.asciidoc
index 5540fa0..4b0a054 100644
--- a/design/XFS_Filesystem_Structure/xfs_filesystem_structure.asciidoc
+++ b/design/XFS_Filesystem_Structure/xfs_filesystem_structure.asciidoc
@@ -34,7 +34,7 @@
 The information contained in this document derives from the XFS source code in
 the Linux kernel as of v4.3.  This book's source code is available at
 +git://git.kernel.org/pub/scm/fs/xfs/xfs-documentation.git+.  Feedback should
-be sent to the XFS mailing list, currently at +xfs@oss.sgi.com+.
+be sent to the XFS mailing list, currently at +linux-xfs@vger.kernel.org+.
 
 [NOTE]
 All fields in XFS metadata structures are in big-endian byte order except for