docs: correct the 8.0.0 changelog purchases example (#40)

Two errors in the example shipped with 8.0.0, both mine.

`entity(id).schedule` is a property holding a ScheduleApi, not a method, so
the snippet as written threw 'schedule is not a function'. The call is
`.schedule.upcoming()`.

The snippet also filtered on `day.type === 'TICKETED_EVENT'`, which matches
nothing useful: purchases are Lightning Lane entries attached to ordinary
OPERATING days. Measured against Magic Kingdom today — 48 TICKETED_EVENT
entries with no purchases, 26 OPERATING entries with them. The filter is
removed and the distinction called out, since filtering on type is the
obvious wrong guess.

The example is now run verbatim against the published 8.0.0 package rather
than written from memory of the API. The entry count is stated as a dated
snapshot because the schedule window rolls.

No code change; the package is unaffected.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: cubehouse

CHANGELOG.md

@@ -15,18 +15,24 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   path is the one this client uses, so `purchases` was invisible and `type`
   was a bare `string`.
 
-  Magic Kingdom alone serves 27 schedule entries carrying `purchases`. If you
-  reached them before, you did it with a cast. You no longer need to:
+  Magic Kingdom served 26 of 79 upcoming entries with `purchases` on the day
+  this shipped. If you reached them before, you did it with a cast. You no
+  longer need to:
 
   ```ts
-  const sched = await tp.entity(parkId).schedule();
+  const sched = await tp.entity(parkId).schedule.upcoming();
   for (const day of sched.schedule ?? []) {
-    if (day.type === 'TICKETED_EVENT') {
-      for (const p of day.purchases ?? []) console.log(p.name, p.price.amount);
+    for (const p of day.purchases ?? []) {
+      console.log(day.date, p.name, p.price.amount, p.price.currency);
+      // 2026-09-08 Lightning Lane for Seven Dwarfs Mine Train 1100 USD
     }
   }
   ```
 
+  Purchases are not limited to `TICKETED_EVENT` days — Lightning Lane entries
+  attach to ordinary `OPERATING` days, so do not filter on `type` to find
+  them.
+
 - **`purchases[].price.amount` is nullable, matching `PriceData`.** 7.1.0 made
   `PriceData.amount` nullable but the schedule path carried a second, inline
   copy of the price shape that kept `amount` non-nullable. Both now resolve to