Update docs

contracts/utils/Strings.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
+// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)
 
 pragma solidity ^0.8.0;
 
@@ -8,6 +8,7 @@ pragma solidity ^0.8.0;
  */
 library Strings {
     bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
+    uint8 private constant _ADDRESS_LENGTH = 20;
 
     /**
      * @dev Converts a `uint256` to its ASCII `string` decimal representation.
@@ -64,4 +65,11 @@ library Strings {
         require(value == 0, "Strings: hex length insufficient");
         return string(buffer);
     }
+
+    /**
+     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
+     */
+    function toHexString(address addr) internal pure returns (string memory) {
+        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
+    }
 }