Fix 721 preset docs

contracts/presets/ERC721PresetMinterPauserAutoId.sol

@@ -33,8 +33,8 @@ contract ERC721PresetMinterPauserAutoId is Context, AccessControl, ERC721Burnabl
     Counters.Counter private _tokenIdTracker;
 
     /**
-     * @dev Grants `DEFAULT_ADMIN_ROLE` and `MINTER_ROLE` to the account that
-     * deploys the contract.
+     * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
+     * account that deploys the contract.
      *
      * Token URIs will be autogenerated based on `baseURI` and their token IDs.
      * See {ERC721-tokenURI}.