Update docs

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

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+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.20;
+
+import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
+
+contract MyContract is Ownable {
+    constructor(address initialOwner) Ownable(initialOwner) {}
+
+    function normalThing() public {
+        // anyone can call this normalThing()
+    }
+
+    function specialThing() public onlyOwner {
+        // only the owner can call specialThing()!
+    }
+}