Move code-update directory to architecture

It makes sense to have the code-update documents under
architecture instead of at the top directory.

Change-Id: Ie850a12adf0507307ca29edddaaff67756c35029
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/Makefile b/Makefile
index e12cdc8..bd88ef6 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@
 	$(tex) $(tflags) $^
 	$(tex) $(tflags) $^
 
-userguide/userguide.tex: rest-api.tex host-management.tex console.tex code-update/code-update.tex
+userguide/userguide.tex: rest-api.tex host-management.tex console.tex architecture/code-update/code-update.tex
 
 %.tex: %.md
 	pandoc -o $@ $^