Update docs/web3.eth.account.rst

Co-authored-by: Felipe Selmo <[email protected]>

Author: miohtama

docs/web3.eth.account.rst

@@ -89,7 +89,7 @@ private key=0x480c4aec9fa..., account=0x9202a9d5D2d129CB400a40e00aC822a53ED81167
 Funding a New Account
 ---------------------
 
-If you create a private key it comes with its own Ethereum address.
+If you create a private key, it comes with its own Ethereum address.
 By default, the balance of this address is zero.
 Before you can send any transactions with your account,
 you need to top up.