Fix incorrect doc imports

Author: ernestognw

docs/modules/ROOT/pages/erc20.adoc

@@ -17,7 +17,7 @@ Here's what our GLD token might look like.
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.19;
 
-import {ERC20} "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
 
 contract GLDToken is ERC20 {
     constructor(uint256 initialSupply) ERC20("Gold", "GLD") {

docs/modules/ROOT/pages/erc721.adoc

@@ -16,7 +16,7 @@ Here's what a contract for tokenized items might look like:
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.19;
 
-import {ERC721URIStorage} "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
+import {ERC721URIStorage} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
 
 contract GameItem is ERC721URIStorage {
     uint256 private _nextTokenId;