Update Purdue doc (#3590)
Update Purdue doc (#3590)


rj175/twofactorauth,vgarmash/twofactorauth,Jawshy/twofactorauth,vgarmash/twofactorauth,jdavis/twofactorauth,Nitrokey/dongleauth,Jawshy/twofactorauth,bjorno/twofactorauth,bjorno/twofactorauth,jdavis/twofactorauth,Jawshy/twofactorauth,Nitrokey/dongleauth,Jawshy/twofactorauth,rj175/twofactorauth,vgarmash/twofactorauth,bjorno/twofactorauth,rj175/twofactorauth,Nitrokey/dongleauth,jdavis/twofactorauth