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Update structs.md (#1403)

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@ -35,7 +35,7 @@ Key Points:
* Unlike in C++, there is no inheritance between structs.
* Methods are defined in an `impl` block, which we will see in following slides.
* This may be a good time to let people know there are different types of structs.
* Zero-sized structs `e.g., struct Foo;` might be used when implementing a trait on some type but don’t have any data that you want to store in the value itself.
* Zero-sized structs (e.g. `struct Foo;`) might be used when implementing a trait on some type but don’t have any data that you want to store in the value itself.
* The next slide will introduce Tuple structs, used when the field names are not important.
* The syntax `..peter` allows us to copy the majority of the fields from the old struct without having to explicitly type it all out. It must always be the last element.