Notification API Version 1.6.4

This release adds three notification topics. See Select a notification topic for additional information.

FEEDBACK_LEFT: A subscription for this topic initiates notifications being sent to a user when they have left feedback for another user.

FEEDBACK_RECEIVED: A subscription for this topic initiates notifications being sent to a user when they have received feedback from another user.

FEEDBACK_STAR_RATING: A subscription for this topic initiates notifications being sent to a user when their feedback star rating has changed.

Additionally, the Topic Descriptions for current Notification Topics were updated for accuracy and consistency.