Clarify hot reload message

[mit-mit]

Small refactoring to ensure hot reload isn't mentioned as VM only

Fixes

• I’ve reviewed the contributor guide and applied the relevant portions to this PR.
• This PR doesn't contain automatically generated corrections or text (Grammarly, LLMs, and similar).
• This PR follows the Google Developer Documentation Style Guidelines — for example, it doesn't use i.e. or e.g., and it avoids I and we (first person).
• This PR uses semantic line breaks of 80 characters or fewer.

Contribution guidelines:

• See our contributor guide for general expectations for PRs.
• Larger or significant changes should be discussed in an issue before creating a PR.
• Code changes should generally follow the Dart style guide and use dart format.
• Updates to code excerpts indicated by <?code-excerpt need to be updated in their source .dart file as well.

[mit-mit]

@vsmenon did I get all the places (I could not find the exact text you had in the issue in search)?

[dart-github-bot]

Visit the preview URL for this PR (updated for commit fdcb235):

https://dart-dev--pr6884-reload-tfodpd6z.web.app

[mit-mit]

Oh, found the text "with Dart VMs instant hot reload"; it's in the video at the top of https://dart.dev

I don't think we have "source" for that video. But I was wondering if we still think that video is important, of we should simplify the landing page a bit, and just drop it? Thoughts @redbrogdon @vsmenon ?

[vsmenon]

The text within the sentence is a bit redundant. Perhaps just "An incremental JavaScript development compiler enabling a fast iteration cycle with stateful hot reload."?

[vsmenon]

It's a nice video, but I favor accuracy. I think it'd be fine to drop / simplify.