feat: add dcl known functions to @radspec helper

[nachomazzara]

I have added some functions to be tested by the agent.

'setOwnerCutPerMillion(uint256)': 'Set marketplace fees to `$1 / 1000000`%',
  'transferMarketplaceOwnership(address)':
    'Transfer ownership of the marketplace to `$1`',
  'transferOwnership(address)': 'Transfer ownership of the contract to `$1`',
  'pause()': 'Pause contract',
  'unpause()': 'Unpause Contract`'

[claassistantio]

All committers have signed the CLA.

[coveralls]

Coverage increased (+0.04%) to 89.773% when pulling 0caa3a8 on nachomazzara:feat/add-dcl-known-functions into e306a11 on aragon:master.

[sohkai]

LGTM, I've also added a small test to make sure we're handling it correctly!