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Update crates/ui/docs/hello-world.md TODO with explanation of SharedString usage (#10664)

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Filled out a comment where there was a TODO to explain SharedString
usage.

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@ -40,7 +40,7 @@ impl<V: 'static> TodoList<V> {
All of this is relatively straightforward.
We use [gpui::SharedString] in components instead of [std::string::String]. This allows us to [TODO: someone who actually knows please explain why we use SharedString].
We use [gpui::SharedString] in components instead of [std::string::String]. This allows us to efficiently handle shared string data across multiple components and threads without the performance overhead of copying strings.
When we want to pass an action we pass a `ClickHandler`. Whenever we want to add an action, the struct it belongs to needs to be generic over the view type `V`.