fix typo in functions

Change-Id: I0d09d6d4f4405d3dc96f7a9eed62f87e5d3f8bc1
diff --git a/functions b/functions
index 01e2dfc..6f09630 100644
--- a/functions
+++ b/functions
@@ -2,7 +2,7 @@
 #
 # The following variables are assumed to be defined by certain functions:
 # ``ENABLED_SERVICES``
-# ``EROR_ON_CLONE``
+# ``ERROR_ON_CLONE``
 # ``FILES``
 # ``GLANCE_HOSTPORT``
 # ``OFFLINE``