DOC-1016: Update AWS credentials to medium tier template

[freakwriter]

Removed separate subheadings to collapse into single list, added more detail on the steps involved.

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[github-actions[bot]]

Overall readability score: 42.61 (🟢 +0.01)

File	Readability
aws.md	61.55 (🟢 +8.77)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [aws.md](https://github.com/n8n-io/n8n-docs/blob/5cf9af5a2185c21675e561788aa395e6b2c54f41/docs/integrations/builtin/credentials/aws.md "docs/integrations/builtin/credentials/aws.md") | 61.55 | 43.59 | 9 | 10.6 | 12.39 | 7.48   | 🟢 +8.77 | 🟢 +2.03 | 🟢 +1.02 | 🟢 +2 | 🟢 +1.52 | 🟢 +0.51 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 42.61 | 34.45 | 11.73 | 14.96 | 14.43 | 8.58   | 🟢 +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

[freakwriter]

Should be a fairly fast review, as I just added more detail and streamlined the format.