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Subject: Update comments about conflicting KRB5_KEYUSAGE_PA  types
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Be more specific about the assignment-number conflict between the
KRB5_KEYUSAGE_PA types S4U_X509_USER_REQUEST/S4U_X509_USER_REPLY on one
side and SAM_CHALLENGE_TRACKID/SAM_RESPONSE on the other side. 
Otherwise, Doxygen comments look uninformative.