Fix EMMC Design Link

840c6e1210 moved emmc-storage-design.md, update the link in
flash-layout.md

Change-Id: Ie6bd8c1e5923ff067b4ccc611d8b6920c5a78c5e
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/architecture/code-update/flash-layout.md b/architecture/code-update/flash-layout.md
index 23d65fd..0258182 100644
--- a/architecture/code-update/flash-layout.md
+++ b/architecture/code-update/flash-layout.md
@@ -131,4 +131,4 @@
 [FHS]: https://refspecs.linuxfoundation.org/fhs.shtml
 [obmc-phosphor-initfs]: https://github.com/openbmc/openbmc/blob/master/meta-phosphor/recipes-phosphor/initrdscripts/obmc-phosphor-initfs.bb
 [preinit-mounts]: https://github.com/openbmc/openbmc/tree/master/meta-phosphor/recipes-phosphor/preinit-mounts
-[eMMC Design Document]: https://github.com/openbmc/docs/blob/master/designs/emmc-storage-design.md
+[eMMC Design Document]: https://github.com/openbmc/docs/blob/master/architecture/code-update/emmc-storage-design.md