docs: fix "empty array" meson syntax
On recent versions of Meson (0.47+) these are synonymous, but we still support older versions than that, so let's use the correct syntax to avoid confusing users of old Meson versions.
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On recent versions of Meson (0.47+) these are synonymous, but we still support older versions than that, so let's use the correct syntax to avoid confusing users of old Meson versions.