i18n(ja): Update contentful.mdx

[masahirokjp]

add line 224, 225, 383

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Locale	File	Note
ja	guides/cms/contentful.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. |