Improve next/future/image Migration docs

[MaedahBatool]

The comparison table for migration to next/future/image looks odd layout-wise. The issue was brought up via this Slack thread.

This PR makes this improvement.

New implementation

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have helpful link attached, see contributing.md

Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added
• Telemetry added. In case of a feature if it's used or not.
• Errors have helpful link attached, see contributing.md

Documentation / Examples

• Make sure the linting passes by running pnpm lint
• The examples guidelines are followed from our contributing doc

[ijjk]

There's a related PR for this here #39309 maybe we want to close that one in favor of this if we want to drop the table cc @styfle

[styfle]

Thanks!