Add notes on v1model architecture for 'const entries' behavior
Add notes on v1model architecture for 'const entries' behavior

The behavior is exactly the same as that described in a recent change
made to the PSA specification:
https://github.com/p4lang/p4-spec/pull/737

p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model