ARM: update tuple definition
ARM: update tuple definition:
The length field in a dhcpv4 option may comprise of two octets (option 143).
Therefore, I propose changing the definition of a "tuple" .
from:
"A length encoded as an 8-bit (16-bit for DHCPv6) unsigned integer followed by a string of this length."
To:
"A length field encoded as an 8-bit or 16-bit (16-bit for DHCPv6) unsigned integer followed by a string of this length."