PIP-0017: fee clarification and typo fixes

PIP/PIP-0017.md

@@ -116,7 +116,8 @@ where
    MIN_FEE = 0.0001 (current protocol)
 ```
 
-**NOTE**: accounts that change keys do **not** pay a fee. In practice, a user wanting to include a ChangeKeyAccount operation should also pro single user can include a SenderAccount to pay for the fee of both SenderAccount and ChangeKeyAcount.
+**NOTE**: ChangeAccountKey entries do **not** pay a fee directly. In practice, their fee portion is covered by a separate SenderAccount entry that pays the fee for both itself and the ChangeKeyAccount entry. Alternatively, a single user could decide to cover someone/everyone elses fee's. The Fee is merely the difference between SUM(SenderQuantity) - SUM(ReceiverQuantity) and must account for all the entries in the multi-transaction. 
+
 - Ensure at least 1 sender
 ```
 SenderCount > 0