C ffi docs update#146856

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lygstate wants to merge 2 commits intorust-lang:masterfrom

lygstate:c_ffi_docs_update

Commits on Sep 21, 2025

c ffi document fixes for c_short.md and c_longlong.md
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Commits on Sep 22, 2025

Avoid duplicate stable and unstable attributes between ffi/mod.rs and ffi/primitives.rs
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