Move some comments of variables to right place

setup_develop*() in functions has been moved to functions-common. But
some comments about the variables are still left.
This commit moves it to the right place.

Change-Id: Ic360454f1ee72f51c9979d0468dee0913e9b32e4
diff --git a/functions b/functions
index 3101111..407a9e7 100644
--- a/functions
+++ b/functions
@@ -6,10 +6,6 @@
 # - ``ENABLED_SERVICES``
 # - ``FILES``
 # - ``GLANCE_HOSTPORT``
-# - ``REQUIREMENTS_DIR``
-# - ``STACK_USER``
-# - ``TRACK_DEPENDS``
-# - ``UNDO_REQUIREMENTS``
 #
 
 # Include the common functions
diff --git a/functions-common b/functions-common
index c93dd85..a485cae 100644
--- a/functions-common
+++ b/functions-common
@@ -26,7 +26,10 @@
 # - ``PIP_DOWNLOAD_CACHE``
 # - ``PIP_USE_MIRRORS``
 # - ``RECLONE``
+# - ``REQUIREMENTS_DIR``
+# - ``STACK_USER``
 # - ``TRACK_DEPENDS``
+# - ``UNDO_REQUIREMENTS``
 # - ``http_proxy``, ``https_proxy``, ``no_proxy``
 
 # Save trace setting