Add note about available variables in the function include file.

datahub-functions.include.example

@@ -4,7 +4,9 @@
 # Currently, only a function called 'get_publication_link()' is used in the main
 # code. This function is used to get the badge link to point to when an ARC has
 # been validated and is marked ready for further processing. This is usually
-# tied to publication plattform of some kind, hence the name.
+# tied to publication plattform of some kind, hence the name. Note that there
+# are a lot of project/job related information available in this context.
+# Refer to the main script for a list of variables or contact us.
 
 get_publication_link() {
 	echo "https://example.com/publish"