fix: make changelog script work with multiline changeset

[massao]

Purpose of PR

• Fix changelog script to format multiline correct.
• Fix changelogs file with correct formatting
• Add changeset file example to documentation

[changeset-bot]

⚠️ No Changeset found

Latest commit: 79dcbaa

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Jun 16, 2023 0:15am

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	143.36 KB (0%)	2.9 s (0%)	117 ms (+69.47% 🔺)	3 s
Module	139.92 KB (0%)	2.8 s (0%)	79 ms (-35.64% 🔽)	2.9 s