Use inclusive language (them instead of him) (#573)

en/5/07-erc721-7.md

@@ -357,14 +357,14 @@ Now, let's implement `approve`.
 
 Remember, with `approve` the transfer happens in 2 steps:
 
-1. You, the owner, call `approve` and give it the `_approved` address of the new owner, and the `_tokenId` you want him to take.
+1. You, the owner, call `approve` and give it the `_approved` address of the new owner, and the `_tokenId` you want them to take.
 
-2. The new owner calls `transferFrom` with the `_tokenId`. Next, the contract checks to make sure the new owner has been already approved, and then transfers him the token.
+2. The new owner calls `transferFrom` with the `_tokenId`. Next, the contract checks to make sure the new owner has been already approved, and then transfers them the token.
 
 Because this happens in 2 function calls, we need to use the `zombieApprovals` data structure to store who's been approved for what in between function calls.
 
 ## Putting it to the Test
 
 1. In the `approve` function, we want to make sure only the owner of the token can give someone approval to take it. So we need to add the `onlyOwnerOf` modifier to `approve`
 
-2. For the body of the function, set `zombieApprovals` for `_tokenId` equal to the `_approved` address.
+2. For the body of the function, set `zombieApprovals` for `_tokenId` equal to the `_approved` address.