add inline docs for CborDecode lib

[emmanuelm41]

closes #275

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[github-actions]

Gas results 🚀📝

Account actor

Function	Gas
authenticate_message	25470920
universal_receiver_hook	5177037

Datacap actor

Function	Gas
name	5931357
symbol	5677689
total_supply	7704555
balance	6851734
allowance	7913811
transfer	17561163
transfer_from	25212107
burn	11301591
burn_from	18196508
allowance	11198295
increase_allowance	13958284
decrease_allowance	13961481
revoke_allowance	12594604

Init actor

Function	Gas
exec	19744082
exec4	6910885

Market actor

Function	Gas
publish_storage_deals	49365661
add_balance	7866253
withdraw_balance	10704962
get_balance	12030319
get_deal_data_commitment	11170181
get_deal_client	6519273
get_deal_provider	6515777
get_deal_label	11375687
get_deal_term	7086042
get_deal_total_price	8635863
get_deal_client_collateral	8444010
get_deal_provider_collateral	8450190
get_deal_verified	6428847
get_deal_activation	7130486

Power actor

Function	Gas
miner_count	5060198
network_raw_power	5500796
miner_raw_power	7006162
miner_consensus_count	5070746

Precompiles actor

Function	Gas
resolve_address	2411070
lookup_delegated_address (empty response)	2328771
lookup_delegated_address (address found)	2415775
resolve_eth_address	2439194

Send actor

Function	Gas
send (actor id)	3653196
send (address)	3653196

Verifreg actor

Function	Gas
add_verified_client	13654452
get_claims	10452471
extend_claim_term	11773419
remove_expired_allocations	13403395
remove_expired_claims	11773419