Merge branch 'main'

exercises/20_threads/README.md

@@ -7,3 +7,4 @@ Within your program, you can also have independent parts that run simultaneously
 
 - [Dining Philosophers example](https://doc.rust-lang.org/1.4.0/book/dining-philosophers.html)
 - [Using Threads to Run Code Simultaneously](https://doc.rust-lang.org/book/ch16-01-threads.html)
+- [Using Message Passing to Transfer Data Between Threads](https://doc.rust-lang.org/book/ch16-02-message-passing.html)

info.toml

@@ -175,10 +175,7 @@ mode = "run"
 hint = """
 The error message points to the function `sale_price` and says it expects a type
 after the `->`. This is where the function's return type should be -- take a
-look at the `is_even` function for an example!
-
-Also: Did you figure out that, technically, `u32` would be the more fitting type
-for the inputs of the functions here, since the original prices shouldn't be negative? If so, kudos!"""
+look at the `is_even` function for an example!"""
 
 [[exercises]]
 name = "functions5"