Copyedits to FFI and unwinding section
These are minor changes that make the text flow better to me.
diff --git a/src/ffi.md b/src/ffi.md
index 8d1a882..853009b 100644
--- a/src/ffi.md
+++ b/src/ffi.md
@@ -722,16 +722,19 @@
## FFI and unwinding
It’s important to be mindful of unwinding when working with FFI. Each
-non-`Rust` ABI comes in two variants, one with `-unwind` suffix and one without. If
-you expect Rust `panic`s or foreign (e.g. C++) exceptions to cross an FFI
-boundary, that boundary must use the appropriate `-unwind` ABI string (note
-that compiling with `panic=abort` will still cause `panic!` to immediately
-abort the process, regardless of which ABI is specified by the function that
-`panic`s).
+ABI comes in two variants, one with `-unwind` suffix and one without (except
+the `Rust` ABI, which always permits unwinding).
+If you expect Rust `panic`s or foreign (e.g. C++) exceptions to cross an FFI
+boundary, that boundary must use the appropriate `-unwind` ABI string.
Conversely, if you do not expect unwinding to cross an ABI boundary, use one of
-the non-`unwind` ABI strings (other than `Rust`, which always permits
-unwinding). If an unwinding operation does encounter an ABI boundary that is
+the non-`unwind` ABI strings.
+
+> Note: Compiling with `panic=abort` will still cause `panic!` to immediately
+abort the process, regardless of which ABI is specified by the function that
+`panic`s.
+
+If an unwinding operation does encounter an ABI boundary that is
not permitted to unwind, the behavior depends on the source of the unwinding
(Rust `panic` or a foreign exception):
