fix: change mapping variable names in favor of clarity

solidity/contracts/Oracle.sol

@@ -20,13 +20,13 @@ contract Oracle is IOracle, OracleAccessController {
   mapping(bytes32 _requestId => uint256 _finalizedAt) public finalizedAt;
 
   /// @inheritdoc IOracle
-  mapping(bytes32 _id => uint256 _requestCreatedAt) public requestCreatedAt;
+  mapping(bytes32 _requestId => uint256 _requestCreatedAt) public requestCreatedAt;
 
   /// @inheritdoc IOracle
-  mapping(bytes32 _id => uint256 _responseCreatedAt) public responseCreatedAt;
+  mapping(bytes32 _responseId => uint256 _responseCreatedAt) public responseCreatedAt;
 
   /// @inheritdoc IOracle
-  mapping(bytes32 _id => uint256 _disputeCreatedAt) public disputeCreatedAt;
+  mapping(bytes32 _disputeId => uint256 _disputeCreatedAt) public disputeCreatedAt;
 
   /// @inheritdoc IOracle
   mapping(bytes32 _responseId => bytes32 _disputeId) public disputeOf;
@@ -35,7 +35,7 @@ contract Oracle is IOracle, OracleAccessController {
   mapping(bytes32 _disputeId => DisputeStatus _status) public disputeStatus;
 
   /// @inheritdoc IOracle
-  mapping(uint256 _requestNumber => bytes32 _id) public nonceToRequestId;
+  mapping(uint256 _nonce => bytes32 _requestId) public nonceToRequestId;
 
   /// @inheritdoc IOracle
   mapping(bytes32 _requestId => bytes32 _finalizedResponseId) public finalizedResponseId;
@@ -111,6 +111,7 @@ contract Oracle is IOracle, OracleAccessController {
     AccessControl[] calldata _accessControl
   ) external returns (bytes32[] memory _batchRequestsIds) {
     uint256 _requestsAmount = _requestsData.length;
+
     _batchRequestsIds = new bytes32[](_requestsAmount);
 
     for (uint256 _i; _i < _requestsAmount;) {