Update docs

contracts/mocks/MerkleProofWrapper.sol

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+// SPDX-License-Identifier: MIT
+
+pragma solidity >=0.6.0 <0.8.0;
+
+import { MerkleProof } from "../cryptography/MerkleProof.sol";
+
+contract MerkleProofWrapper {
+    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) public pure returns (bool) {
+        return MerkleProof.verify(proof, root, leaf);
+    }
+}