RfcommTest: No-op fixes

- Fix spelling of "waiting" in a helper method
- Fix documentation comments to be in line with best practices
- Change the order of helper functions to be more intuitive

Bug: 345006660
Test: atest BumbleBluetoothTests:RfcommTest
Flag: TEST_ONLY
Change-Id: I7382abd22c95be0f123160fe087fdaf569db3ae2