PkiPath reference

Both of the below should work (they are supposed to be the same, I have
only checked the X.509 one):

ITU-T Recommendation X.509(2000) Corrigendum 1(2001)

or

ISO/IEC 9594-8:2001/Cor.1:2002, Technical Corrigendum 1 to ISO/IEC
9594:8:2001.

	/Russin