[Whisper] Update docs to better explain use of `prompt` and `temperature` for transcription and translation

[rmtuckerphx]

Describe the bug

The docs do not clearly explain the use of prompt and temperature when it comes to the transcription and translation endpoints.

Include a sample file with various prompt values to clarify.

To Reproduce

Read docs

Code snippets

No response

OS

Windows 11

Node version

Node v16.16.0

Library version

openai v3.2.0