specify txs should be RLP encoded for measuring IL size

Author: Marchhill

EIPS/eip-7805.md

@@ -115,7 +115,7 @@ The full Engine API changes can be found in the [Execution APIs](https://github.
 
 #### IL Building
 
-The rules for building ILs are left to the discretion of implementers. For instance, they may select transactions from the public mempool in various ways such as at random, by priority fee, or based on how long they have been pending. The IL has a maximum size of `MAX_BYTES_PER_INCLUSION_LIST = 8 KiB` for all of the unserialised transactions.
+The rules for building ILs are left to the discretion of implementers. For instance, they may select transactions from the public mempool in various ways such as at random, by priority fee, or based on how long they have been pending. The IL has a maximum size of `MAX_BYTES_PER_INCLUSION_LIST = 8 KiB` for all of the RLP encoded transactions.
 
 ### Consensus Layer