Docs updates for E/A#91717 QBO vendor bill available with report field locations

[MelvinBot]

Explanation of Change

Expensify/App#91717 changed the QuickBooks Online company card export picker so the Vendor bill option is only hidden when locations are imported as tags (syncLocations === TAG). When locations are imported as report fields (Control plan), Vendor bill remains available, and the in-product footer copy now describes the tag-specific restriction.

This updates Configure-Quickbooks-Online.md to match that behavior:

• Import > Locations note: Clarified that locations must be imported as report fields for Vendor bill / Check exports, and that those options are unavailable when locations are imported as tags. Also fixed casing (Vendor bill) to match the UI.
• Export company card expenses as > Vendor bill: Added a note that Vendor bill is unavailable when locations are imported as tags, mirroring the in-product footer.
• FAQ "Why can't I export reports as vendor bills or checks?": Removed the inaccurate "Locations can only be used as tags" statement. Exports are blocked specifically when locations are imported as tags; importing locations as report fields (Control plan) keeps Vendor bill and Check available.

Fixed Issues

$ #83788

Tests

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QA

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@yichensunjoe, please review the files changed and confirm they reflect the current behavior. Then mark this PR Ready for review.

[yichensunjoe]

I reviewed the docs update against #91717. The direction matches the product behavior, but one existing line still reads:

Locations: Import as tags.

That still implies tags are the only supported import mode, which conflicts with the new note explaining that Vendor bill / Check remain available when locations are imported as report fields. I think this should be adjusted before marking the PR ready, e.g.:

Locations: Import as tags or report fields.

The rest of the changes look aligned with the current behavior: Vendor bill and Check should be unavailable only when locations are imported as tags, and available when locations are imported as report fields on Control.