Capture state.count when entering .task in GettingStartted.md (#1330)

Fixes #1329.

(cherry picked from commit 2014089c06c60302d8570b9e849c0246d126ac84)

Author: tgrapperon

Sources/ComposableArchitecture/Documentation.docc/Articles/GettingStarted.md

@@ -116,9 +116,9 @@ let appReducer = Reducer<
     return .none
 
   case .numberFactButtonTapped:
-    return .task {
+    return .task { [count = state.count] in
       await .numberFactResponse(
-        TaskResult { try await environment.numberFact(state.count) }
+        TaskResult { try await environment.numberFact(count) }
       )
     }