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Update text/3668-async-closures.md 

add the note in one other place

Co-authored-by: Josh Triplett <josh@joshtriplett.org>
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@ -111,6 +111,8 @@ In order for this to work, the `FnMut` trait would need to be ["lending"](https:
# Guide Level Explanation
(**note**: See the [naming blocking concern](#what-do-we-call-the-trait) about `async Fn*` vs `AsyncFn*` syntax. This RFC uses the `async Fn` syntax for trait bounds to avoid duplicating explanations for two different proposed syntaxes, but the syntax remains an open question.)
Just as you can write functions which accept closures, you can write functions which accept async closures:
```rust