* docs: Update Remote Taskfiles default values
This change updates the documentation for [Remote Taskfiles > Configuration](https://taskfile.dev/docs/experiments/remote-taskfiles#configuration) for `timeout` and `cache-expiry` to match the defaults in code.
* docs: Update `cache-expiry` default to 0s
* docs: Update executor.go comment
Fix doc comment to indicate that cache expiry default duration is 0.
