Fix use of ^ (xor) instead of ** (power) (#3130)

docs/modules/ROOT/pages/erc20.adoc

@@ -58,9 +58,9 @@ To work around this, xref:api:token/ERC20.adoc#ERC20[`ERC20`] provides a xref:ap
 
 How can this be achieved? It's actually very simple: a token contract can use larger integer values, so that a balance of `50` will represent `5 GLD`, a transfer of `15` will correspond to `1.5 GLD` being sent, and so on.
 
-It is important to understand that `decimals` is _only used for display purposes_. All arithmetic inside the contract is still performed on integers, and it is the different user interfaces (wallets, exchanges, etc.) that must adjust the displayed values according to `decimals`. The total token supply and balance of each account are not specified in `GLD`: you need to divide by `10^decimals` to get the actual `GLD` amount.
+It is important to understand that `decimals` is _only used for display purposes_. All arithmetic inside the contract is still performed on integers, and it is the different user interfaces (wallets, exchanges, etc.) that must adjust the displayed values according to `decimals`. The total token supply and balance of each account are not specified in `GLD`: you need to divide by `10 ** decimals` to get the actual `GLD` amount.
 
-You'll probably want to use a `decimals` value of `18`, just like Ether and most ERC20 token contracts in use, unless you have a very special reason not to. When minting tokens or transferring them around, you will be actually sending the number `num GLD * 10^decimals`.
+You'll probably want to use a `decimals` value of `18`, just like Ether and most ERC20 token contracts in use, unless you have a very special reason not to. When minting tokens or transferring them around, you will be actually sending the number `num GLD * (10 ** decimals)`.
 
 NOTE: By default, `ERC20` uses a value of `18` for `decimals`. To use a different value, you will need to override the `decimals()` function in your contract.
 
@@ -73,7 +73,7 @@ function decimals() public view virtual override returns (uint8) {
 So if you want to send `5` tokens using a token contract with 18 decimals, the method to call will actually be:
 
 ```solidity
-transfer(recipient, 5 * 10^18);
+transfer(recipient, 5 * (10 ** 18));
 ```
 
 [[Presets]]