fixes the title in specification
fixes the title in specification

Might be an historical artefact but I believe the correct full name for CNI should be Container Network Interface 

CC: da39a3ee5e6b4b0d3255bfef95601890afd80709@bboreham
dcbw/cni,appc/cni,containernetworking/cni,containernetworking/cni,appc/cni,dcbw/cni