fix: remove experimental and update comments in cli-reference.mdx

[ArmandPhilippot]

Description (required)

Adds two changes to cli-reference.mdx:

• the comment above each command was still using "start script" instead of dev so I updated the comments
• Astro Env was still marked as experimental in the astro sync section so I removed that mention

Related issues & labels (optional)

• Suggested label: typo/link/grammar - quick fix!

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en/reference/cli-reference.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[sarah11918]

Again, perfect, and so appreciated! 💜