remove calldata mention from blob gas

EIPS/eip-4844.md

@@ -277,7 +277,7 @@ For early draft implementations, we simply change `get_blob_gas(parent)` to alwa
 ### Gas accounting (Full version)
 
 We introduce data gas as a new type of gas. It is independent of normal gas and follows its own targeting rule, similar to EIP-1559.
-We use the `excess_blobs` header field to store persistent data needed to compute the data gas price. For now, only blobs are priced in data gas. In the future this could be extended to also cover calldata (at a different relative gas cost).
+We use the `excess_blobs` header field to store persistent data needed to compute the data gas price. For now, only blobs are priced in data gas.
 
 ```python
 def calc_data_fee(tx: SignedBlobTransaction, parent: Header) -> int: