Enhance device code documentation with semantics details

[n3rada]

Hello there 👋

I would like to add a foldable Details section documenting the lifecycle and constraints of device codes.

The goal is to clearly explain what is and is not possible once a device code has been issued and consumed, in particular:

• the single-use nature of device codes,
• when access and refresh tokens can be obtained,
• and why it is not possible to obtain new tokens once the initial refresh token has expired or been rejected (e.g. AADSTS70043 due to Conditional Access / sign-in frequency).

This clarification would have been useful when investigating whether a new access token or refresh token could be obtained after the lifetime of the first refresh token ended, without forcing a new device authentication.

I believe this addition will help avoid incorrect assumptions and reduce future confusion around the device code flow.