[xacml] AA22: editorial: fix reference to RFC 2821 in B.4

Text location: Section B.4 "Data types", paragraph starting "An
rfc822Name...", last word, p. 108, line 4220.

Text change: change 'under the term "Mailbox".Numeric' to 'under
the term "Mailbox".'

Anne
-- 
Anne H. Anderson             Email: 
Sun Microsystems Laboratories
1 Network Drive,UBUR02-311     Tel: 781/442-0928
Burlington, MA 01803-0902 USA  Fax: 781/442-1692