Add note about recreating ordered consumer

Ordered Consumers should be recreated when heartbeats are missed. This behaviour was not implemented in all clients and should be, especially after switching ordered consumers to memory storage and R1 which makes them much easier to loose.
nats-io · Sep 28, 2022 · 5585135 · 5585135
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commit 5585135
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diff --git a/adr/ADR-17.md b/adr/ADR-17.md
@@ -20,6 +20,8 @@ The subscription must track the last good stream and consumer sequences.
 When a gap is observed, the subscription closes its current subscription,
 releases its consumer and creates a new one starting at the proper stream sequence.
 
+If hearbeats are missed, consumer might be gone (deleted, lost after reconnect, node restart, etc.), and it should be recreated from last known stream sequence.
+
 You can optionally make the "state" available to the user.
 
 ### Subscription Limitations