Added notes for PBL and its relation to MTU Bug 4961507 Change-Id: I1bfcd10b5868b880f4ba7f1ae8e38dbac690c75d Signed-off-by: Aniruddha Paul <anpaul@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/kernel/nvethernetrm/+/3280253 Reviewed-by: svcacv <svcacv@nvidia.com> GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com> Reviewed-by: Srinivas Ramachandran <srinivasra@nvidia.com>