Correct the use of get_data_column_sidecars

Author: ppopth

specs/_features/eip7594/das-core.md

@@ -244,7 +244,7 @@ In this construction, we extend the blobs using a one-dimensional erasure coding
 
 ### Parameters
 
-For each column -- use `data_column_sidecar_{subnet_id}` subnets, where `subnet_id` can be computed with the `compute_subnet_for_data_column_sidecar(column_index: ColumnIndex)` helper. The sidecars can be computed with the `get_data_column_sidecars(signed_block: SignedBeaconBlock, blobs: Sequence[Blob])` helper.
+For each column -- use `data_column_sidecar_{subnet_id}` subnets, where `subnet_id` can be computed with the `compute_subnet_for_data_column_sidecar(column_index: ColumnIndex)` helper. The sidecars can be computed with `cells_and_kzg_proofs = [compute_cells_and_kzg_proofs(blob) for blob in blobs]` and then `get_data_column_sidecars(signed_block, cells_and_kzg_proofs)`.
 
 Verifiable samples from their respective column are distributed on the assigned subnet. To custody a particular column, a node joins the respective gossipsub subnet. If a node fails to get a column on the column subnet, a node can also utilize the Req/Resp protocol to query the missing column from other peers.