[Documentation] Add comments to mock tokens

Author: ayodeko

contracts/mocks/ERC20MockToken.sol

@@ -4,9 +4,17 @@ pragma solidity 0.8.25;
 import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
 import "@openzeppelin/contracts/access/Ownable.sol";
 
+/// @title ERC20MockToken
+/// @notice A mock ERC20 token for testing purposes, with minting and burning capabilities controlled by the owner.
+/// @dev Extends the OpenZeppelin ERC20 and Ownable contracts.
 contract ERC20MockToken is ERC20, Ownable {
+    /// @dev Custom decimal places for the mock token.
     uint8 private immutable _decimals;
 
+    /// @notice Constructor to initialize the mock token with a name, symbol, and decimals.
+    /// @param name The name of the token.
+    /// @param symbol The symbol of the token.
+    /// @param decimals_ The number of decimal places for the token.
     constructor(
         string memory name,
         string memory symbol,
@@ -15,14 +23,22 @@ contract ERC20MockToken is ERC20, Ownable {
         _decimals = decimals_;
     }
 
+    /// @notice Mints new tokens to the specified account.
+    /// @param account The address of the account to mint tokens to.
+    /// @param amount The amount of tokens to mint.
     function mint(address account, uint256 amount) external onlyOwner {
         _mint(account, amount);
     }
 
+    /// @notice Burns tokens from the specified account.
+    /// @param account The address of the account to burn tokens from.
+    /// @param amount The amount of tokens to burn.
     function burn(address account, uint256 amount) external onlyOwner {
         _burn(account, amount);
     }
 
+    /// @notice Returns the number of decimals used to get its user representation.
+    /// @return The number of decimals.
     function decimals() public view override returns (uint8) {
         return _decimals;
     }

contracts/mocks/ERC721MockToken.sol

@@ -4,14 +4,23 @@ pragma solidity 0.8.25;
 import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
 import "@openzeppelin/contracts/access/Ownable.sol";
 
+/// @title ERC721MockToken
+/// @notice A mock ERC721 token for testing purposes, with minting capabilities controlled by the owner.
+/// @dev Extends the OpenZeppelin ERC721 and Ownable contracts.
 contract ERC721MockToken is ERC721, Ownable {
+    /// @dev Counter for tracking the next token ID to be minted.
     uint256 private _nextTokenId;
 
+    /// @notice Constructor to initialize the mock token with a name and symbol.
+    /// @param name The name of the token.
+    /// @param symbol The symbol of the token.
     constructor(
         string memory name,
         string memory symbol
     ) ERC721(name, symbol) Ownable(msg.sender) {}
 
+    /// @notice Mints a new token to the specified address.
+    /// @param to The address to mint the token to.
     function safeMint(address to) public onlyOwner {
         uint256 tokenId = _nextTokenId++;
         _safeMint(to, tokenId);