qip-0007: remove incorrect reference to RLP

qip-0007.md

@@ -58,7 +58,7 @@ The value field of a transaction output is constrained to 1 of 16 denominations,
 ### Transaction Structure
 Every transaction must reference a set of unspent transaction outputs as inputs to be spent, and create new transaction outputs to be added to the UTXO set. Transaction inputs will be referenced by the hash of the transaction which minted them and the index of the output in that transaction. Additionally, each transaction must contain a valid aggregate signature from each UTXO key.
 
-Putting it all together, transactions will contain the following data, RLP encoded:
+Putting it all together, transactions will contain the following data:
 ```
 transaction: {
   chainId: uint256, // for replay protection