Remove/document remaining Electra TODOs (#6982)

Not essential to merge this now, but I'm going through TODOs for Electra to make sure we haven't missed anything.

Targeting this at the release branch anyway so that auditors/readers don't get alarmed 😅

beacon_node/execution_layer/src/lib.rs

@@ -209,6 +209,7 @@ pub enum BlockProposalContents<E: EthSpec, Payload: AbstractExecPayload<E>> {
         /// `None` for blinded `PayloadAndBlobs`.
         blobs_and_proofs: Option<(BlobsList<E>, KzgProofs<E>)>,
         // TODO(electra): this should probably be a separate variant/superstruct
+        // See: https://github.com/sigp/lighthouse/issues/6981
         requests: Option<ExecutionRequests<E>>,
     },
 }

consensus/state_processing/src/genesis.rs

@@ -123,8 +123,7 @@ pub fn initialize_beacon_state_from_eth1<E: EthSpec>(
         // Remove intermediate Deneb fork from `state.fork`.
         state.fork_mut().previous_version = spec.electra_fork_version;
 
-        // TODO(electra): think about this more and determine the best way to
-        // do this. The spec tests will expect that the sync committees are
+        // The spec tests will expect that the sync committees are
         // calculated using the electra value for MAX_EFFECTIVE_BALANCE when
         // calling `initialize_beacon_state_from_eth1()`. But the sync committees
         // are actually calcuated back in `upgrade_to_altair()`. We need to

consensus/state_processing/src/per_block_processing/verify_attestation.rs

@@ -63,7 +63,7 @@ pub fn verify_attestation_for_state<'ctxt, E: EthSpec>(
 ) -> Result<IndexedAttestationRef<'ctxt, E>> {
     let data = attestation.data();
 
-    // TODO(electra) choosing a validation based on the attestation's fork
+    // NOTE: choosing a validation based on the attestation's fork
     // rather than the state's fork makes this simple, but technically the spec
     // defines this verification based on the state's fork.
     match attestation {

consensus/types/src/validator.rs

@@ -249,7 +249,6 @@ impl Validator {
         }
     }
 
-    /// TODO(electra): refactor these functions and make it simpler.. this is a mess
     /// Returns `true` if the validator is partially withdrawable.
     fn is_partially_withdrawable_validator_capella(&self, balance: u64, spec: &ChainSpec) -> bool {
         self.has_eth1_withdrawal_credential(spec)