Improve next/future/image Migration docs (#39421)
The [comparison table for migration](https://nextjs.org/docs/api-reference/next/future/image#migration) to `next/future/image` looks odd layout-wise. The issue was brought up via this [Slack thread](https://vercel.slack.com/archives/C02F56A54LU/p1660040275310949).
This PR makes this improvement.
### New implementation
<img width="1216" alt="image" src="https://user-images.githubusercontent.com/12712988/183631902-6850836b-cb4e-44ea-909f-ba353725be15.png">
## 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](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)
Co-authored-by: Steven <229881+styfle@users.noreply.github.com>
