blobsDataFromStoredDataColumns: Ask the use to use the --supernode flag and shorten the error mesage. (#16097)

**What type of PR is this?**
Other

**What does this PR do? Why is it needed?**
`blobsDataFromStoredDataColumns`: Ask the use to use the `--supernode`
flag and shorten the error mesage.

**Acknowledgements**
- [x] I have read
[CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment
file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description to this PR with sufficient context for
reviewers to understand this PR.

beacon-chain/rpc/lookup/blocker.go

@@ -450,7 +450,7 @@ func (p *BeaconDbBlocker) blobsDataFromStoredDataColumns(root [fieldparams.RootL
 	if count < peerdas.MinimumColumnCountToReconstruct() {
 		// There is no way to reconstruct the data columns.
 		return nil, &core.RpcError{
-			Err:    errors.Errorf("the node does not custody enough data columns to reconstruct blobs - please start the beacon node with the `--%s` flag to ensure this call to succeed, or retry later if it is already the case", flags.Supernode.Name),
+			Err:    errors.Errorf("the node does not custody enough data columns to reconstruct blobs - please start the beacon node with the `--%s` flag to ensure this call to succeed", flags.SemiSupernode.Name),
 			Reason: core.NotFound,
 		}
 	}

changelog/manu-logs-beacon-chain.md

@@ -0,0 +1,3 @@
+### Changed
+
+- `blobsDataFromStoredDataColumns`: Ask the use to use the `--supernode` flag and shorten the error mesage.