move username change doc to the correct place in doc

[ayatnkw]

Moved the doc to the Cloud section and changed formatting to match the docs styleguide

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[github-actions[bot]]

Overall readability score: 43.23 (🟢 +0)

File	Readability
change-ownership-or-username.md	76.89 (🟢 +0)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [change-ownership-or-username.md](https://github.com/n8n-io/n8n-docs/blob/5f3fafe92f806a0c53e580ff2c41ab89242f9abc/docs/manage-cloud/change-ownership-or-username.md "docs/manage-cloud/change-ownership-or-username.md") | 76.89 | 70.43 | 9.66 | 8.8 | 8.12 | 6.42   | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 43.23 | 34.93 | 11.66 | 14.86 | 14.34 | 8.53   | 🟢 +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