Reorder helpers to group ones operating on updates

specs/altair/sync-protocol.md

@@ -18,9 +18,9 @@
 - [Helper functions](#helper-functions)
   - [`is_sync_committee_update`](#is_sync_committee_update)
   - [`is_finality_update`](#is_finality_update)
-  - [`get_subtree_index`](#get_subtree_index)
-  - [`get_safety_threshold`](#get_safety_threshold)
   - [`is_better_update`](#is_better_update)
+  - [`get_safety_threshold`](#get_safety_threshold)
+  - [`get_subtree_index`](#get_subtree_index)
 - [Light client state updates](#light-client-state-updates)
     - [`process_slot_for_light_client_store`](#process_slot_for_light_client_store)
     - [`validate_light_client_update`](#validate_light_client_update)
@@ -111,23 +111,6 @@ def is_finality_update(update: LightClientUpdate) -> bool:
     return update.finality_branch != [Bytes32() for _ in range(floorlog2(FINALIZED_ROOT_INDEX))]
 ```
 
-### `get_subtree_index`
-
-```python
-def get_subtree_index(generalized_index: GeneralizedIndex) -> uint64:
-    return uint64(generalized_index % 2**(floorlog2(generalized_index)))
-```
-
-### `get_safety_threshold`
-
-```python
-def get_safety_threshold(store: LightClientStore) -> uint64:
-    return max(
-        store.previous_max_active_participants,
-        store.current_max_active_participants,
-    ) // 2
-```
-
 ### `is_better_update`
 
 ```python
@@ -172,6 +155,23 @@ def is_better_update(new_update: LightClientUpdate, old_update: LightClientUpdat
     return new_update.signature_slot < old_update.signature_slot
 ```
 
+### `get_safety_threshold`
+
+```python
+def get_safety_threshold(store: LightClientStore) -> uint64:
+    return max(
+        store.previous_max_active_participants,
+        store.current_max_active_participants,
+    ) // 2
+```
+
+### `get_subtree_index`
+
+```python
+def get_subtree_index(generalized_index: GeneralizedIndex) -> uint64:
+    return uint64(generalized_index % 2**(floorlog2(generalized_index)))
+```
+
 ## Light client state updates
 
 A light client maintains its state in a `store` object of type `LightClientStore` and receives `update` objects of type `LightClientUpdate`. Every `update` triggers `process_light_client_update(store, update, current_slot, genesis_validators_root)` where `current_slot` is the current slot based on a local clock. `process_slot_for_light_client_store` is triggered every time the current slot increments.