docs: update 11-13-data-import.md

[habib424]

Drafted by Ship Ship 🚢 — confidence 🟢 high

What changed

Added "Bank Recipient Name" to the list of fields in the "Importing vendor master" section. This field captures the recipient name that appears on payment instructions and can be bulk-edited via CSV import and export.

Source PRs

• light#6800 — feat(CD-1041): generalise undo-import to Accounts Receivable
• light#6778 — Add bank recipient name to vendor CSV import and export

How to use this PR

1. Review the diff against the existing article — focus on accuracy and customer voice.
2. Merge if it reads well. Edit and push to this branch if it needs adjustment.
3. Close without merging if the article doesn't actually need this update.

Once we have a track record of clean drafts, we'll graduate to auto-merge with a delay buffer. For now: human-in-the-loop.