<!-- Please describe your changes on the following line: -->
1. Fix for a comment typo in `bluetooth.rs `.
2. Simplify caling `self.request_bluetooth_devices` in `bluetooth.rs` in `Step 2`.
We already have a check in `Step 1` to prevent calling `request_bluetooth_devices` with a `Some` value if `option.acceptAllDevices` is true, and `option.filters` is already an `Option`, so there is no need for the `None` in the else branch.
3. Updating the bluetooth extension in `Navigator.webidl `, to match the [specification](https://webbluetoothcg.github.io/web-bluetooth/#navigator-extensions).
4. Replace the `_` separating the characteristic property strings with `-` as described [here](http://git.kernel.org/cgit/bluetooth/bluez.git/tree/doc/gatt-api.txt#n142)
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
Source-Repo: https://github.com/servo/servo
Source-Revision: 4f53626c23e0affc6fca3bf1f4f1f3c722f58074
fe7df5e893