docs

Signed-off-by: Derek Riley <derek.riley@swirldslabs.com>

Author: derektriley

hedera-node/docs/design/app/blocks/BlockNodeConnectionManager.md

@@ -166,6 +166,7 @@ Used when retrying the same block node after transient issues:
 
 When another block node should be selected and forced to become active, the previous active connection
 is closed and scheduled for retry after a fixed delay of 180s (`blockNode.forcedSwitchRescheduleDelay`).
+This may happen when the block buffer saturation action stage is triggered and the manager force switches to a different node.
 
 #### Retry State Management