DOC-998: Make Facebook App credentials more detailed

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Overall readability score: 42.5 (🟢 +0.02)

File	Readability
facebookapp.md	71.98 (🟢 +24.95)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [facebookapp.md](https://github.com/n8n-io/n8n-docs/blob/0e603b743288ea7bb6355516413c2365f6918d88/docs/integrations/builtin/credentials/facebookapp.md "docs/integrations/builtin/credentials/facebookapp.md") | 71.98 | 50.94 | 7.32 | 9.9 | 11.35 | 6.28   | 🟢 +24.95 | 🟢 +18.85 | 🟢 +2.32 | 🟢 +5.6 | 🟢 +4.82 | 🟢 +0.91 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 42.5 | 34.36 | 11.76 | 14.98 | 14.43 | 8.58   | 🟢 +0.02 | 🟢 +0.02 | 🟢 +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