DOC-1055: Update FileMaker credentials to medium tier template

[freakwriter]

Expand the prerequisite steps to more directly link to FileMaker's docs; convert to numbered instructions.

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Overall readability score: 43.02 (🟢 +0)

File	Readability
filemaker.md	51.35 (🟢 +4.24)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [filemaker.md](https://github.com/n8n-io/n8n-docs/blob/e964cd281ca623e5969910b27d96f3ecacedb987/docs/integrations/builtin/credentials/filemaker.md "docs/integrations/builtin/credentials/filemaker.md") | 51.35 | 18.01 | 7.87 | 13.9 | 15.87 | 6.92   | 🟢 +4.24 | 🔴 -7.55 | 🟢 +1.75 | 🔴 -0.2 | 🔴 -0.63 | 🟢 +1.14 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 43.02 | 34.74 | 11.68 | 14.89 | 14.37 | 8.55   | 🟢 +0 | 🔴 -0.01 | 🟢 +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