remove reference to trimmed signatures until that is more developed.

Author: fiatjaf

29.md

@@ -36,10 +36,6 @@ This is a hack to prevent messages from being broadcasted to external relays tha
 
 Relays should prevent late publication (messages published now with a timestamp from days or even hours ago) unless they are open to receive a group forked or moved from another relay.
 
-## Trimmed signatures
-
-Relays must strip the signature of messages in groups that are `private` so they do not leak.
-
 ## Event definitions
 
 - *text root note* (`kind:11`)