Remove incorrect statement that migrations are not environment specific

[joshthoward]

Summary

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Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Clarified that migrations are environment-specific in the Durable Objects documentation.

• Removed incorrect statement regarding migrations not being environment-specific.
• Updated migration examples for clarity and consistency.
• Improved formatting for better readability.

Modified Files

• src/content/docs/durable-objects/reference/durable-objects-migrations.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/durable-objects/	@elithrar, @vy-ton, @joshthoward, @oxyjun, @harshil1712, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://fecf6203.preview.developers.cloudflare.com
Preview Branch URL: https://joshthoward-do-migration-edit.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/durable-objects/reference/durable-objects-migrations/	https://joshthoward-do-migration-edit.preview.developers.cloudflare.com/durable-objects/reference/durable-objects-migrations/
https://developers.cloudflare.com/durable-objects/reference/environments/	https://joshthoward-do-migration-edit.preview.developers.cloudflare.com/durable-objects/reference/environments/