fix: changeAppState to toggleState

[ktym4a]

Description (required)

Sample code was outdated, so I change it.

Related issues & labels (optional)

reference: withastro/astro#10933 (comment)

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	May 8, 2024 3:05am

[astrobot-houston]

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Locale	File	Note
en	reference/dev-toolbar-app-reference.mdx	Source changed, localizations will be marked as outdated.
ko	reference/dev-toolbar-app-reference.mdx	Localization changed, will be marked as complete.
zh-cn	reference/dev-toolbar-app-reference.mdx	Localization changed, will be marked as complete.

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.

[liruifengv]

LGTM!