docs: add the right npm command regarding astro --help for examples' README.md files

[lauthieb]

Changes

This PR adds the right npm command regarding astro --help for examples' README.md files.
UPDATE: no changeset following this advice in review: #6864 (review)

Current

Expected

Testing

There's no test because I'm just enhancing markdown files.

Docs

There's no docs added because that's only markdown files that will be generated when users will create a new project with astro CLI.

Thanks :)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4646510

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.

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[bluwy]

This change make sense to me. I think we need to indent the other rows' | characters so they're aligned as well. I also think the changeset can be removed as they doesn't affect the published packages

[lauthieb]

This change make sense to me. I think we need to indent the other rows' | characters so they're aligned as well. I also think the changeset can be removed as they doesn't affect the published packages

@bluwy thanks for your review and pieces of advice!
I've updated this PR accordingly with this commit: 4646510

[yanthomasdev]

LGTM, thanks for this @lauthieb. Feel free to merge when you're satisfied @bluwy 🙌

[bluwy]

Looks great! Thanks for making the changes