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Demonstrate the preferred syntax of index projection in DMA documentation and examples. A few `[i]?` cases are converted to demonstrate the new variant. Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Gary Guo <gary@garyguo.net> Acked-by: Danilo Krummrich <dakr@kernel.org> Link: https://patch.msgid.link/20260602-projection-syntax-rework-v2-4-6989470f5440@garyguo.net Signed-off-by: Miguel Ojeda <ojeda@kernel.org>