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Update text/XXX-unwind-FFI.md 

Fix typo caught in review

Co-Authored-By: bjorn3 <bjorn3@users.noreply.github.com>
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@ -82,7 +82,7 @@ unwinding across the FFI boundary is well-defined and safe,
and in fact it can be a useful way to handle errors and in fact it can be a useful way to handle errors
when working with certain C libraries, such as `libjpeg`. when working with certain C libraries, such as `libjpeg`.
Thus, the `may_panic` function may be makred `#[unwind(allow)]`, Thus, the `may_panic` function may be marked `#[unwind(allow)]`,
which ensures that the unwinding operation will be propagated to the caller which ensures that the unwinding operation will be propagated to the caller
rather than aborting the process. rather than aborting the process.
This annotation will also prevent the compiler This annotation will also prevent the compiler