Mullvad changed how WireGuard key is generated

[XargonWan]

URL to the Wiki page

https://github.com/qdm12/gluetun-wiki/blob/main/setup/providers/mullvad.md

What's incorrect?

WIREGUARD_PRIVATE_KEY is your 32 bytes key in base64 format. The private key can only be obtained by [generating a Wireguard configuration file](https://mullvad.net/en/account/#/wireguard-config). The Wireguard Key displayed on the [Manage devices and ports](https://mullvad.net/en/account/#/ports) page on Mullvad is not the private key that is required. Generate a Wireguard configuration file, download the zip file, extract any of the .json files within and use the PrivateKey value. Note this value is the same for all Mullvad servers. 💁 https://github.com/qdm12/gluetun/discussions/805#discussioncomment-2026642.

This part of the guide is now unaligned, can you please fix it?
At the moment of writing I didn't find out the solution.

EDIT: it seems like that in order to get your wireguard file you must generate a new key, if you miss the chance you have to delete the device codename and regen a new one, but still is not working on my side.

EDIT2: after completely destroying the container and related it worked again.

[github-actions]

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