Update docs

docs/modules/api/examples/utilities/Base64NFT.sol

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+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.20;
+
+import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import {Strings} from "@openzeppelin/contracts/utils/Strings.sol";
+import {Base64} from "@openzeppelin/contracts/utils/Base64.sol";
+
+contract Base64NFT is ERC721 {
+    using Strings for uint256;
+
+    constructor() ERC721("Base64NFT", "MTK") {}
+
+    // ...
+
+    function tokenURI(uint256 tokenId) public pure override returns (string memory) {
+        // Equivalent to:
+        // {
+        //   "name": "Base64NFT #1",
+        //   // Replace with extra ERC-721 Metadata properties
+        // }
+        // prettier-ignore
+        string memory dataURI = string.concat("{\"name\": \"Base64NFT #", tokenId.toString(), "\"}");
+
+        return string.concat("data:application/json;base64,", Base64.encode(bytes(dataURI)));
+    }
+}

docs/modules/api/examples/utilities/Multicall.sol

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+// contracts/Box.sol
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {Multicall} from "@openzeppelin/contracts/utils/Multicall.sol";
+
+contract Box is Multicall {
+    function foo() public {
+        // ...
+    }
+
+    function bar() public {
+        // ...
+    }
+}