Summary:
- Added a section to the Rust guide that explains how to use the `RUSTFLAGS` environment variable to specify the target CPU for optimization.
- Provides examples and instructions for setting `RUSTFLAGS` for different CPU models, such as Cortex-M33 and Cortex-M55, to generate performance-optimized code.
Impact:
- Enhances the developer's ability to produce more efficient Rust applications on NuttX by leveraging CPU-specific optimizations.
- No runtime or functional changes; only documentation improvements to guide users in optimizing their build configurations for specific hardware.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
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