stays: save LA Airbnb check-in guide

TODO.md

@@ -13,9 +13,10 @@ Open items before and during the trip. Tick and date when done.
 - [ ] **Print the pass PDF** after purchase and carry the physical copy.
   An unstaffed entrance requires a physical pass or printed PDF to be
   displayed. Ask the ranger for a physical pass at the first staffed entry.
-- [ ] **KT: complete the LA DTLA online check-in form** —
-  [Hostaway portal](https://guest-portal.hostaway.com/65596088/dxYlP4ov/check-in).
-  Entry code is activated only after it's submitted.
+- [ ] **KT: complete the LA DTLA online check-in form** — host check-in guide
+  received Sep 24; apartment code and parking instructions are recorded in the
+  [booking file](bookings/stays/airbnb-la-dtla.md). The entry code is activated
+  only after the form is submitted. Use the [Hostaway portal](https://guest-portal.hostaway.com/65596088/dxYlP4ov/check-in).
 - [ ] **MS: assign Air Canada seats** for the YVR ↔ SFO flights.
   See [`flights-ms.md`](bookings/transport/flights-ms.md).
 - [x] **MS: move today's SIXT pickup after the flight delay** — completed;