Document ScrollViewReader problem (#268)

Author: stephencelis

Sources/ComposableArchitecture/SwiftUI/WithViewStore.swift

@@ -7,11 +7,12 @@ import SwiftUI
 /// Due to a bug in SwiftUI, there are times that use of this view can interfere with some core
 /// views provided by SwiftUI. The known problematic views are:
 ///
-/// * If a `GeometryReader` is used inside a `WithViewStore` it will not receive state updates
-///   correctly. To work around you either need to reorder the views so that `GeometryReader`
-///   wraps the `WithViewStore`, or, if that is not possible, then you must hold onto an explicit
-///   `@ObservedObject var viewStore: ViewStore<State, Action>` in your view in lieu of using
-///   this helper (see [here](https://gist.github.com/mbrandonw/cc5da3d487bcf7c4f21c27019a440d18)).
+/// * If a `GeometryReader` or `ScrollViewReader` is used inside a `WithViewStore` it will not
+///   receive state updates correctly. To work around you either need to reorder the views so that
+///   the `GeometryReader` or `ScrollViewReader` wraps `WithViewStore`, or, if that is not possible,
+///   then you must hold onto an explicit `@ObservedObject var viewStore: ViewStore<State, Action>`
+///   in your view in lieu of using this helper (see
+///   [here](https://gist.github.com/mbrandonw/cc5da3d487bcf7c4f21c27019a440d18)).
 /// * If you create a `Stepper` via the `Stepper.init(onIncrement:onDecrement:label:)` initializer
 ///   inside a `WithViewStore` it will behave erratically. To work around you should use the
 ///   initializer that takes a binding (see