Clarify Notesnook encryption

docs/notebooks.md

@@ -60,7 +60,7 @@ If you are currently using an application like Evernote, Google Keep, or Microso
         - [:simple-firefoxbrowser: Firefox](https://notesnook.com/notesnook-web-clipper/)
         - [:simple-googlechrome: Chrome](https://chrome.google.com/webstore/detail/notesnook-web-clipper/kljhpemdlcnjohmfmkogahelkcidieaj)
 
-Notesnook does not support password/PIN protection on the web & desktop apps. However, you can still lock individual notes, and your data is always encrypted in transit and on your device using your master key.
+Notesnook only allows local note encryption with the [private vault](https://help.notesnook.com/lock-notes-with-private-vault) feature on their pro plan, otherwise your notes are not stored encrypted on your device. Your notes are always encrypted before being synced to their servers with keys which only you have access to.
 
 ### Joplin