Cosmetic.md: Add a tip for using —force-device as an argument for AudioDxe, and provide a short guide on finding a codec’s default sampling rate

[Thisisauser6443]

The argument can be referred to from section 11.9.1 of the Configuration PDF, but for ease of debugging, this should also be added as an additional tip to the boot chime section

Same logic applies for the guide on identifying the default sampling rate