I don't believe you can subscribe to edits, notifications would typically hang of the comments/replies.
Nicole, you can do this for TKBs that have been edited. Click on your Avatar > My subscriptions > Notification Settings > Scroll to "Edits to published knowledge base articles and topics in areas I subscribe to".
Is this what you are looking for?
Crystal Lockett | Product Coach Lead, Community & Experiences
Need help using any of the Khoros products? Sign up for a 1-on-1, interactive Product Coaching session with a platform expert! See all available sessions here