Clean up Gloas specs (part 5) (#4738)

- Remove `remove_flag`
- Place `ForkChoiceNode` under `Helpers`
- Make validator duty description more accurate

Author: ensi321

specs/gloas/beacon-chain.md

@@ -38,7 +38,6 @@
     - [New `is_parent_block_full`](#new-is_parent_block_full)
   - [Misc](#misc-2)
     - [Modified `get_pending_balance_to_withdraw`](#modified-get_pending_balance_to_withdraw)
-    - [New `remove_flag`](#new-remove_flag)
     - [New `compute_balance_weighted_selection`](#new-compute_balance_weighted_selection)
     - [New `compute_balance_weighted_acceptance`](#new-compute_balance_weighted_acceptance)
     - [Modified `compute_proposer_indices`](#modified-compute_proposer_indices)
@@ -438,14 +437,6 @@ def get_pending_balance_to_withdraw(state: BeaconState, validator_index: Validat
     )
 ```
 
-#### New `remove_flag`
-
-```python
-def remove_flag(flags: ParticipationFlags, flag_index: int) -> ParticipationFlags:
-    flag = ParticipationFlags(2**flag_index)
-    return flags & ~flag
-```
-
 #### New `compute_balance_weighted_selection`
 
 ```python

specs/gloas/fork-choice.md

@@ -7,7 +7,7 @@
 - [Introduction](#introduction)
 - [Custom types](#custom-types)
 - [Constants](#constants)
-- [Containers](#containers)
+- [Helpers](#helpers)
   - [New `ForkChoiceNode`](#new-forkchoicenode)
   - [Modified `LatestMessage`](#modified-latestmessage)
   - [Modified `update_latest_messages`](#modified-update_latest_messages)
@@ -61,7 +61,7 @@ This is the modification of the fork-choice accompanying the Gloas upgrade.
 | `PAYLOAD_STATUS_EMPTY`     | `PayloadStatus(1)`      |
 | `PAYLOAD_STATUS_FULL`      | `PayloadStatus(2)`      |
 
-## Containers
+## Helpers
 
 ### New `ForkChoiceNode`
 

specs/gloas/validator.md

@@ -84,9 +84,9 @@ future assignments by noting their assigned PTC slot.
 
 All validator responsibilities remain unchanged other than the following:
 
-- Proposers are no longer required to broadcast `BlobSidecar` objects, as this
-  becomes a builder's duty.
-- Some validators are selected per slot to become PTC members, these validators
+- Proposers are no longer required to broadcast `DataColumnSidecar` objects, as
+  this becomes a builder's duty.
+- Some attesters are selected per slot to become PTC members, these validators
   must broadcast `PayloadAttestationMessage` objects during the assigned slot
   before the deadline of `get_attestation_due_ms(epoch)` milliseconds into the
   slot.