Commands `aut validator --help`: typo 'unbondign' and `commission-rate-precision`

[cmjc]

Calling the protocol commands 2 notes:

• typos "unbondign" in:

  head-unbonding-id          Head ID of unbondign queue
  tail-unbonding-id          Tail ID of unbondign queue

• command commission-rate-precision Precision of validator commission rate values

I don't think this should be exposed. It's an internal validation check.

To reproduce:

Run aut protocol --help to view the options.

Usage: aut protocol [OPTIONS] COMMAND [ARGS]...

  Commands related to Autonity-specific protocol operations.  See the Autonity
  contract reference for details.

Options:
  --help  Show this message and exit.

Commands:
  commission-rate-precision  Precision of validator commission rate values
  config                     Print the Autonity contract config
  deployer                   Contract deployer
  epoch-id                   ID of current epoch
  epoch-reward               Reward for this epoch
  epoch-total-bonded-stake   Total stake bonded this epoch
  get-bonding-req            Get queued bonding information between start...
  get-committee              Get current committee"
  get-committee-enodes       Enodes in current committee
  get-last-epoch-block       Block of last epoch
  get-max-committee-size     Maximum committee size
  get-minimum-base-fee       Minimum base fee
  get-operator               Contract operator
  get-proposer               Proposer at the given height and round
  get-unbonding-req          Get queued unbonding information between...
  get-validators             Get current validators
  get-version                Contract version
  head-bonding-id            Head ID of bonding queue
  head-unbonding-id          Head ID of unbondign queue
  last-epoch-block           Block number of the last epoch
  tail-bonding-id            Tail ID of bonding queue
  tail-unbonding-id          Tail ID of unbondign queue
  total-redistributed        Total fees redistributed