Doc: Added some comments to labels, to clarify their current/future use

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5659 43c1dc8c-776e-4df2-8ef1-6e829299be21
Doc: Updated some comments to labels, to clarify their current/future use

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5660 43c1dc8c-776e-4df2-8ef1-6e829299be21