/docs/reference/layout/gridの翻訳 (#242)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Shunsuke KIMURA <kimushun1101@gmail.com>
Co-authored-by: 3w36zj6 <52315048+3w36zj6@users.noreply.github.com>

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