fix typo

Co-authored-by: Gary Guo <[email protected]>

Author: RalfJung

compiler/rustc_mir_transform/src/ffi_unwind_calls.rs

@@ -12,7 +12,7 @@ use crate::errors;
 
 /// Some of the functions declard as "may unwind" by `fn_can_unwind` can't actually unwind. In
 /// particular, `extern "C"` is still considered as can-unwind on stable, but we need to to consider
-/// it cannot-unwind here. So below we check `fn_can_unwind() && abi_can_unwind()` before cincluding
+/// it cannot-unwind here. So below we check `fn_can_unwind() && abi_can_unwind()` before concluding
 /// that a function call can unwind.
 fn abi_can_unwind(abi: Abi) -> bool {
     use Abi::*;