Identity Assurance - Allow more claims in the respective sub-element

[Torsten Lodderstedt]

Mike Pegman pointed out that there could be much more claims involved in identity assurance than the list maintained in the document. That's certainly true, the respective definition should be replaced with text defining the preconditions for inclusion of a certain claim.

[Torsten Lodderstedt]

added sentence explaining the preconditions for adding other user claims to this container

[Torsten Lodderstedt]

done