docs: fix input guide example to bound the wait with wait_duration (#955)

The "Pass input to an Actor" guide example claimed that
`timeout=timedelta(seconds=60)` makes `call()` wait up to 60 seconds for
the run to finish. It doesn't. On `call()`, `timeout` is the per-request
HTTP timeout forwarded to `start()`, while the wait cap is
`wait_duration` (default `None`, i.e. wait indefinitely). A user copying
the example would block indefinitely on a long or never-finishing run.
The sync and async examples now use
`wait_duration=timedelta(seconds=60)` and the comment is reworded
accordingly.

The stale copies under `website/versioned_docs/` are left untouched on
purpose. The versioning workflow deletes and re-snapshots `version-3.0`
from `docs/` on every 3.x release, so the fix propagates there
automatically.