Update Solidity files in docs (#4956)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

contracts/mocks/docs/access-control/AccessControlModified.sol

@@ -0,0 +1,14 @@
+// contracts/AccessControlModified.sol
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {AccessControl} from "../../../access/AccessControl.sol";
+
+contract AccessControlModified is AccessControl {
+    error AccessControlNonRevokable();
+
+    // Override the revokeRole function
+    function revokeRole(bytes32, address) public pure override {
+        revert AccessControlNonRevokable();
+    }
+}