Fix unavailable code-update.md link

Fix unavailable code-update.md link.

Tested:
The new link test is OK

Signed-off-by: Chicago Duan <duanzhijia01@inspur.com>
Change-Id: If5466abb8eb28570e90c921eb629f92fe17f0ba7
diff --git a/README.md b/README.md
index 6221433..da9dc85 100644
--- a/README.md
+++ b/README.md
@@ -157,4 +157,4 @@
 [2]: https://github.com/openbmc/docs/blob/master/cheatsheet.md#building-the-openbmc-sdk
 [3]: https://github.com/openbmc/phosphor-power/tree/master/tools/power-utils
 [4]: https://github.com/openbmc/phosphor-psu-code-mgmt/blob/master/tools/generate-psu-tar
-[5]: https://github.com/openbmc/docs/blob/master/code-update/code-update.md
+[5]: https://github.com/openbmc/docs/blob/master/architecture/code-update/code-update.md