Add ATM90E32 Offset calibration

[descipher]

Description:

Added doc for optional offset calibration capability

Pull request in esphome with YAML changes (if applicable): #7228

Checklist:

• [X] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [ ] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [ ] Link added in /index.rst when creating new documents for new components or cookbook.

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