Update openbmc-systemd.md link

openbmc-systemd.md is moving under architecture/ as part of
https://gerrit.openbmc-project.xyz/c/openbmc/docs/+/26325

26325 should merge before this is merged.

Change-Id: Iaa300ca65f862042716d4f385c6f752ffc509fe4
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/README.md b/README.md
index d47bb63..d230b8d 100644
--- a/README.md
+++ b/README.md
@@ -123,7 +123,7 @@
 ./configure ${CONFIGURE_FLAGS} && make
 ```
 
-[1]: https://github.com/openbmc/docs/blob/master/openbmc-systemd.md
+[1]: https://github.com/openbmc/docs/blob/master/architecture/openbmc-systemd.md
 [2]: https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/openbmc_project/State/BMC.interface.yaml
 [3]: https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/openbmc_project/State/Chassis.interface.yaml
 [4]: https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/openbmc_project/State/Host.interface.yaml