docs: fix dangling fragment in tty-adapter.md ADR list (ADR-010 bullet edit leftover)

docs/architecture/tty-adapter.md

@@ -396,7 +396,6 @@ architectural commitment.
   channels path's semantic failures are establisher call errors
   (`channel:open_failed`); the in-band frames shrink to
   `allocate_failed`
-  `input` is the negotiation)
 - alknet ADR-050 — the ownership model the adapter's access control
   declares against
 - alknet ADR-007 — `Connection`, `accept_bi`, the handler-receives-