docs: update 4-1-connecting-bank-accounts.md

[habib424]

Drafted by Ship Ship 🚢 — confidence 🟢 high

What changed

Cleaned up step 7 in the "Adding a Bank Account" section to consolidate the two redundant mentions of Swedish Bankgiro into a single, clearer bullet point that matches the actual UI behavior (Bankgiro field appears when bank country is set to Sweden).

Source PRs

• axolotl#4299 — feat(BLUE-928): add Bankgiro field to bank account settings

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.