fix: clarify initialization needs for data service extensions (TRST-R06)

Signed-off-by: Tomás Migone <[email protected]>

Author: tmigone

packages/horizon/contracts/data-service/extensions/DataServiceFees.sol

@@ -14,6 +14,8 @@ import { DataServiceFeesV1Storage } from "./DataServiceFeesStorage.sol";
  * @dev Implementation of the {IDataServiceFees} interface.
  * @notice Extension for the {IDataService} contract to handle payment collateralization
  * using a Horizon provision. See {IDataServiceFees} for more details.
+ * @dev This contract inherits from {DataService} which needs to be initialized, please see
+ * {DataService} for detailed instructions.
  */
 abstract contract DataServiceFees is DataService, DataServiceFeesV1Storage, IDataServiceFees {
     using ProvisionTracker for mapping(address => uint256);

packages/horizon/contracts/data-service/extensions/DataServicePausable.sol

@@ -14,6 +14,8 @@ import { DataService } from "../DataService.sol";
  * pause guardians.
  * @dev Note that this extension does not provide an external function to set pause
  * guardians. This should be implemented in the derived contract.
+ * @dev This contract inherits from {DataService} which needs to be initialized, please see
+ * {DataService} for detailed instructions.
  */
 abstract contract DataServicePausable is Pausable, DataService, IDataServicePausable {
     /// @notice List of pause guardians and their allowed status

packages/horizon/contracts/data-service/extensions/DataServicePausableUpgradeable.sol

@@ -10,6 +10,8 @@ import { DataService } from "../DataService.sol";
  * @title DataServicePausableUpgradeable contract
  * @dev Implementation of the {IDataServicePausable} interface.
  * @dev Upgradeable version of the {DataServicePausable} contract.
+ * @dev This contract inherits from {DataService} which needs to be initialized, please see
+ * {DataService} for detailed instructions.
  */
 abstract contract DataServicePausableUpgradeable is PausableUpgradeable, DataService, IDataServicePausable {
     /// @notice List of pause guardians and their allowed status

packages/horizon/contracts/data-service/extensions/DataServiceRescuable.sol

@@ -17,6 +17,8 @@ import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.s
  * that calls this contract's _rescueTokens.
  * @dev Note that this extension does not provide an external function to set
  * rescuers. This should be implemented in the derived contract.
+ * @dev This contract inherits from {DataService} which needs to be initialized, please see
+ * {DataService} for detailed instructions.
  */
 abstract contract DataServiceRescuable is DataService, IDataServiceRescuable {
     /// @notice List of rescuers and their allowed status