Fix typo in Lesson 16 Chapter 6 (CryptozombiesHQ#499)

Co-authored-by: Andrei Popescu <[email protected]>

en/16/06.md

@@ -166,7 +166,7 @@ To accomplish this, you're going to use a `mapping` that'll associate each reque
 
 ## Put It to the Test
 
-We've gone ahead and removed the `onlyOwner` modifier from the `setLatestEthPrice` function definition, and added a `require` statement that makes sure `oracles.has` `(msg.sender)` (once again, please excuse the grammar!). We've also added the line of code that defines the `requestIdToResponse` mapping. Make sure you browse through the code before moving on.
+We've gone ahead and removed the `onlyOwner` modifier from the `setLatestEthPrice` function definition, and added a `require` statement that makes sure `oracles.has(msg.sender)` (once again, please excuse the grammar!). We've also added the line of code that defines the `requestIdToResponse` mapping. Make sure you browse through the code before moving on.
 
 1. Let's start by defining a `struct` named `Response` with the following properties inside of it: `oracleAddress` (an `address`), `callerAddress` (an `address`), and `ethPrice` (a `uint256`).
 2. Now let's move to the `setLatestEthPrice`. Declare a `Response` variable called `resp`. It should be stored in `memory`.