dev-doc: Fix typo on BMC service restart

Change-Id: I6c99b14788b7d81da28a94cdacb1fe99421e36ce
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/development/sdk-hello-world.md b/development/sdk-hello-world.md
index bf69bbf..3af72ec 100644
--- a/development/sdk-hello-world.md
+++ b/development/sdk-hello-world.md
@@ -94,7 +94,7 @@
   on this, but for now just run the following to restart the BMC state service
   and have it pick up your new application:
   ```
-  systemctl restart xyz.openbmc_project.State.service
+  systemctl restart xyz.openbmc_project.State.BMC.service
   ```
 
   Since systemd started your service, the