lnd updatechanpolicy has confusing --help

Background

lncli updatechanpolicy states that the default --time_lock_delta is 0:

--time_lock_delta value  the CLTV delta that will be applied to all forwarded HTLCs (default: 0)

However:

lncli updatechanpolicy --fee_rate 0.001 --base_fee_msat 100000 --time_lock_delta 0```

results in

[lncli] rpc error: code = Unknown desc = time lock delta of 0 is too small, minimum supported is 4

### Your environment

lncli version 0.4.2 commit=a0b2fadea35fa4642daf4e9f56e6ecfe31d22ce1

### Steps to reproduce

lncli updatechanpolicy --fee_rate 0.001 --base_fee_msat 100000 --time_lock_delta 0```

Expected behaviour

Unsure

Actual behaviour

Error. See above.