DOC-1006: Update MongoDB credentials to medium tier template

[freakwriter]

Opted to keep the prerequisites section since it has so much stuff in it.

Updated to use a numbered list instead of bullet points.

[netlify[bot]]

✅ Deploy Preview for n8n-docs ready!

Name	Link
🔨 Latest commit	9260a816fb5b89a844cf76bde2d935c75813dffa
🔍 Latest deploy log	https://app.netlify.com/sites/n8n-docs/deploys/66b28c648f95ed000951906c
😎 Deploy Preview	https://deploy-preview-2326--n8n-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[github-actions[bot]]

Overall readability score: 42.58 (🟢 +0)

File	Readability
mongodb.md	64.61 (🟢 +1.12)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [mongodb.md](https://github.com/n8n-io/n8n-docs/blob/9260a816fb5b89a844cf76bde2d935c75813dffa/docs/integrations/builtin/credentials/mongodb.md "docs/integrations/builtin/credentials/mongodb.md") | 64.61 | 44.61 | 6.92 | 11.6 | 13.89 | 6.58   | 🟢 +1.12 | 🟢 +0 | 🟢 +0.13 | 🟢 +0.2 | 🟢 +0.18 | 🟢 +0.11 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 42.58 | 34.43 | 11.74 | 14.97 | 14.43 | 8.58   | 🟢 +0 | 🟢 +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