Update docs

docs/modules/api/examples/access-control/AccessControlModified.sol

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