DOC-1011: Update Jira credentials to medium template

[freakwriter]

• Small tweaks for readability.
• Numbered steps, including detailed steps on how to get an API token.
• Added most common cloud domain as an example.

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[github-actions[bot]]

Overall readability score: 42.57 (🔴 -0.01)

File	Readability
jira.md	60.85 (🔴 -6.5)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [jira.md](https://github.com/n8n-io/n8n-docs/blob/92235b9b1f002c2d659d684bef98bf707d50c26b/docs/integrations/builtin/credentials/jira.md "docs/integrations/builtin/credentials/jira.md") | 60.85 | 35.44 | 6.88 | 12.8 | 13.95 | 6.73   | 🔴 -6.5 | 🔴 -11.81 | 🔴 -0.52 | 🔴 -2.7 | 🔴 -1.7 | 🟢 +0.83 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 42.57 | 34.42 | 11.74 | 14.97 | 14.43 | 8.58   | 🔴 -0.01 | 🔴 -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