docs(world): add NatSpec to Create2, Create2Factory (#1628)

packages/world/src/Create2.sol

@@ -1,6 +1,10 @@
 // SPDX-License-Identifier: MIT
 pragma solidity >=0.8.21;
 
+/**
+ * @title Create2
+ * @dev Library to deploy contracts using the CREATE2 opcode.
+ */
 library Create2 {
   /**
    * @dev Deploys a contract using `CREATE2`. The address where the contract
@@ -13,9 +17,17 @@ library Create2 {
    *
    * - `bytecode` must not be empty.
    * - `salt` must have not been used for `bytecode` already.
+   *
+   * @param byteCode The bytecode of the contract to be deployed.
+   * @param salt A 256-bit value that, combined with the bytecode, determines the address.
+   * @return addr The address of the newly deployed contract.
+   * @dev If the CREATE2 fails, reverts
    */
   function deploy(bytes memory byteCode, uint256 salt) internal returns (address addr) {
     assembly {
+      // byteCode is one word (0x20 bytes) with the length, followed by the actual
+      // code for the constructor. So the code starts at byteCode+0x20, and is mload(byteCode)
+      // bytes long.
       addr := create2(0, add(byteCode, 0x20), mload(byteCode), salt)
       if iszero(extcodesize(addr)) {
         revert(0, 0)

packages/world/src/Create2Factory.sol

@@ -4,13 +4,22 @@ pragma solidity >=0.8.21;
 import { Create2 } from "./Create2.sol";
 
 /**
-  @dev Helper Contract to facilitate create2 deployment of Contracts.
-*/
+ * @title Create2Factory
+ * @dev Helper Contract to facilitate create2 deployment of Contracts.
+ */
 contract Create2Factory {
+  /**
+   * @dev Emitted when a new contract is deployed using the `deployContract` function.
+   * @param addr The address of the newly deployed contract.
+   * @param salt The salt value used in the `CREATE2` operation.
+   */
   event ContractDeployed(address addr, uint256 salt);
 
   /**
    * @dev Deploys a new Contract using create2.
+   * @param byteCode The bytecode of the contract to be deployed.
+   * @param salt A 256-bit value that, combined with the bytecode, determines the address.
+   * @dev Emit ContractDeployed on success
    */
   function deployContract(bytes memory byteCode, uint256 salt) public {
     address addr = Create2.deploy(byteCode, salt);