NEW ISSUE 4041: [Primer] Update primer to mention ignorable as needed

<http://www.w3.org/Bugs/Public/show_bug.cgi?id=4041>

Title: [Primer] Update Primer [1] to reflect introduction of  
ignorable to framework [2]

Description:
The primer document does not mention ignorable.

Target: Primer for Policy Assertion Authors

Proposal:

Update primer to mention ignorable as appropriate

[1]  <http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy- 
primer.html?content-type=text/html;%20charset=utf-8>

[2] <http://www.w3.org/TR/2006/WD-ws-policy-20061117/ 
#ignorable_policy_assertion>

regards, Frederick

Frederick Hirsch
Nokia