DOC-980: Update Airtable credential to template

[freakwriter]

Summary of changes:

• Adjusts all instructions to detailed numbered instructions
• Tightens wording

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[github-actions[bot]]

Overall readability score: 42.35 (🟢 +0.01)

File	Readability
airtable.md	64.03 (🟢 +5.99)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [airtable.md](https://github.com/n8n-io/n8n-docs/blob/632b5ca908a037d10e2a0a792f970c9cbc485c19/docs/integrations/builtin/credentials/airtable.md "docs/integrations/builtin/credentials/airtable.md") | 64.03 | 35.13 | 7.13 | 11.6 | 13.55 | 6.31   | 🟢 +5.99 | 🟢 +1.52 | 🟢 +1.17 | 🟢 +1.2 | 🟢 +1.05 | 🟢 +0.16 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 42.35 | 34.25 | 11.78 | 15.01 | 14.45 | 8.59   | 🟢 +0.01 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0

View metric targets

Metric | Range | Ideal score --- | --- | --- Flesch Reading Ease | 100 (very easy read) to 0 (extremely difficult read) | 60 Gunning Fog | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Auto. Read. Index | 6 (very easy read) to 14 (extremely difficult read) | 8 or less Coleman Liau Index | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Dale-Chall Readability | 4.9 (very easy read) to 9.9 (extremely difficult read) | 6.9 or less