i18n(ja): update build-forms-api.mdx

[Yusaku01]

Description (required)

This PR's change is based on the following a commit:

• https://github.com/withastro/docs/pull/12828/changes#diff-2df3d7c3a3d1dad6fdaf6759c4b43ba26d48ca498907e6b4b7ecaf41470d65ca

Also, some of the indentation was off, so I cleaned it up to match the English version😌

Related issues & labels (optional)

• Suggested label: i18n

I'd appreciate it if you could review this when you have time🫡

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Tracked Files

File	Note
ja/recipes/build-forms-api.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.

[morinokami]

LGTM! ありがとうございます！