message_cache: Rename update_to_dict_cache to update_message_cache.

This better describes what it does.

zerver/actions/message_edit.py

@@ -40,7 +40,7 @@ from zerver.lib.message import (
     topic_wildcard_mention_allowed,
     truncate_topic,
 )
-from zerver.lib.message_cache import update_to_dict_cache
+from zerver.lib.message_cache import update_message_cache
 from zerver.lib.queue import queue_json_publish
 from zerver.lib.stream_subscription import get_active_subscriptions_for_stream_id
 from zerver.lib.stream_topic import StreamTopicTarget
@@ -353,7 +353,7 @@ def do_update_embedded_data(
 
     message.save(update_fields=["content", "rendered_content"])
 
-    event["message_ids"] = update_to_dict_cache(changed_messages)
+    event["message_ids"] = update_message_cache(changed_messages)
 
     def user_info(um: UserMessage) -> Dict[str, Any]:
         return {
@@ -758,7 +758,7 @@ def do_update_message(
     if stream_being_edited is not None:
         realm_id = stream_being_edited.realm_id
 
-    event["message_ids"] = update_to_dict_cache(changed_messages, realm_id)
+    event["message_ids"] = update_message_cache(changed_messages, realm_id)
 
     def user_info(um: UserMessage) -> Dict[str, Any]:
         return {

zerver/actions/reactions.py

@@ -10,7 +10,7 @@ from zerver.lib.message import (
     should_change_visibility_policy,
     visibility_policy_for_participation,
 )
-from zerver.lib.message_cache import update_to_dict_cache
+from zerver.lib.message_cache import update_message_cache
 from zerver.lib.stream_subscription import subscriber_ids_with_stream_history_access
 from zerver.lib.streams import access_stream_by_id
 from zerver.models import Message, Reaction, Recipient, Stream, UserMessage, UserProfile
@@ -41,7 +41,7 @@ def notify_reaction_update(
     }
 
     # Update the cached message since new reaction is added.
-    update_to_dict_cache([message])
+    update_message_cache([message])
 
     # Recipients for message update events, including reactions, are
     # everyone who got the original message, plus subscribers of

zerver/lib/message_cache.py

@@ -77,7 +77,7 @@ def message_to_dict_json(message: Message, realm_id: Optional[int] = None) -> by
     return MessageDict.to_dict_uncached([message], realm_id)[message.id]
 
 
-def update_to_dict_cache(
+def update_message_cache(
     changed_messages: Collection[Message], realm_id: Optional[int] = None
 ) -> List[int]:
     """Updates the message as stored in the to_dict cache (for serving