add environment documentation (#2785)

[christapley]

No description provided.

[opbld31]

Docs Build status updates of commit b92ffeb:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/customize-settings/profile-general.md	✅Succeeded	View

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[cinnamon-msft]

I'll just block this until the functionality is implemented in terminal :)

[mattwojo]

Hey @cinnamon-msft -- Has this been implemented yet?

[floh96]

@mattwojo no the pr microsoft/terminal#9287 still needs a review.

[mattwojo]

Closing - this issue has been open for over a year and half in the Terminal product repo: microsoft/terminal#9287

We can reopen or open a new PR on the docs once the feature has been added in the product. Thanks for filing this!