See and change authentication credentials (user/pwd), reauthenticate

[fodorg01]

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Before requesting a new feature / a new sensor

• [x] The feature I'm requesting exists in the myVAILLANT app, and I attached a screenshot
• [x] I tested the latest release, and it's missing there
• [ ] I've attached exported data of my system

Describe the feature you want

• I would like to see the user credentials (user name or e-mail, potentially the password) that is used by this integration.
• I would like to be able to re-authenticate:
  • either with the same credentials
  • or with new user / credentials (belonging to the same home/system though) without losing existing entities.

This might be already possible but couldn't figure out how. In that case this is a feature request only on the documentation.

Screenshot

I can do it if necessary.