Replace confirmRelayedCall with approveRelayedCall (#1904)

* Replace confirmRelayedCall with approveRelayedCall

* Update gsn-bouncers.adoc

* Update deprecated enums

(cherry picked from commit 9c733a7bf811459f3668461cf8c0fdf14c2b68a1)

docs/modules/ROOT/pages/gsn-bouncers.adoc

@@ -81,9 +81,9 @@ function acceptRelayedCall(
           address(this) // Prevents replays in multiple recipients
       );
       if (keccak256(blob).toEthSignedMessageHash().recover(approvalData) == _trustedSigner) {
-          return _confirmRelayedCall();
+          return _approveRelayedCall();
       } else {
-          return _declineRelayedCall(uint256(GSNRecipientSignedDataErrorCodes.INVALID_SIGNER));
+          return _rejectRelayedCall(uint256(GSNRecipientSignedDataErrorCodes.INVALID_SIGNER));
       }
   }
 ----
@@ -95,11 +95,11 @@ When the signatures match, the function returns the following:
 [source,solidity]
 ----
 
-  return _confirmRelayedCall();
+  return _approveRelayedCall();
 
   // Defined on base class GSNBouncerBase
   // uint256 constant private RELAYED_CALL_ACCEPTED = 0;
-  // function _confirmRelayedCall(bytes memory context) internal pure returns (uint256, bytes memory) {
+  // function _approveRelayedCall(bytes memory context) internal pure returns (uint256, bytes memory) {
   //    return (RELAYED_CALL_ACCEPTED, context);
   // }
 ----
@@ -109,11 +109,11 @@ On the other hand, when the signatures don't match, the call gets rejected with
 [source,solidity]
 ----
 
-  return _declineRelayedCall(uint256(GSNRecipientSignedDataErrorCodes.INVALID_SIGNER));
+  return _rejectRelayedCall(uint256(GSNBouncerSignatureErrorCodes.INVALID_SIGNER));
 
   // Defined on base class GSNBouncerBase
   // uint256 constant private RELAYED_CALL_REJECTED = 11;
-  // function _declineRelayedCall(uint256 errorCode) internal pure returns (uint256, bytes memory) {
+  // function _rejectRelayedCall(uint256 errorCode) internal pure returns (uint256, bytes memory) {
   //    return (RELAYED_CALL_REJECTED + errorCode, "");
   // }
 ----
@@ -165,12 +165,12 @@ function acceptRelayedCall(
     returns (uint256, bytes memory)
 {
     if (_token.balanceOf(from) < maxPossibleCharge) {
-        return _declineRelayedCall(uint256(GSNRecipientERC20ChargeErrorCodes.INSUFFICIENT_BALANCE));
+        return _rejectRelayedCall(uint256(GSNBouncerERC20FeeErrorCodes.INSUFFICIENT_BALANCE));
     } else if (_token.allowance(from, address(this)) < maxPossibleCharge) {
-        return _declineRelayedCall(uint256(GSNRecipientERC20ChargeErrorCodes.INSUFFICIENT_ALLOWANCE));
+        return _rejectRelayedCall(uint256(GSNBouncerERC20FeeErrorCodes.INSUFFICIENT_ALLOWANCE));
     }
 
-    return _confirmRelayedCall(abi.encode(from, maxPossibleCharge, transactionFee, gasPrice));
+    return _approveRelayedCall(abi.encode(from, maxPossibleCharge, transactionFee, gasPrice));
 }
 ----