Add Spain (TicketBAI & VERI*FACTU) columns to NN Nature of VAT table

[deboragracio]

What

Adds two columns — ES (TicketBAI) and ES (VERI*FACTU) — to the ftChargeItemCase → NN – Nature of VAT table in general/reference-tables/reference-tables.md.

Why

While comparing this docs page against the source of truth in fiskaltrust/businesscase, the Spanish VAT-exemption mappings were found to be present in the source but missing from the published docs. The IT and GR columns already matched; only the two ES columns were absent. This brings the docs back in sync.

Changes

• New columns ES (TicketBAI) and ES (VERI*FACTU), values copied verbatim from businesscase doc/compliance-middleware/receipt-request.md.
• Populated for NN rows 10, 20, 30, 50, 60, 80 (rows 00/40/70 and the VERI*FACTU cells for 60/80 are empty in the source too).
• Fixes a pre-existing malformed row (NN = 50) whose IT/GR cell boundary was a literal tab instead of a |, which would otherwise misalign the new columns. All NN rows now have a consistent 6-column structure.

Notes for reviewer

• The PT column that exists in the source was not added — it is empty for every row there, so nothing would be carried over.
• Scope is intentionally limited to the ES columns. Other minor source/docs drift found during the comparison (e.g. heading casing, draft ??? rows already removed from docs) was left untouched.
• Out of scope here: a separate field-name bug in businesscase data-model.md (ftChargeItems should be ftChargeItemID) — that lives in a different repo; the docs side is already correct.

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