SE-0472: Add missing () to function type in Task.immediate{Detached} declarations

Author: xedin

proposals/0472-task-start-synchronously-on-caller-context.md

@@ -107,15 +107,15 @@ extension Task {
         name: String? = nil, // Introduced by SE-0469
         priority: TaskPriority? = nil,
         executorPreference taskExecutor: consuming (any TaskExecutor)? = nil,
-        @_inheritActorContext(always) operation: sending @escaping async throws(Failure) -> Success
+        @_inheritActorContext(always) operation: sending @escaping () async throws(Failure) -> Success
     ) -> Task<Success, Failure>
 
     @discardableResult
     public static func immediateDetached(
         name: String? = nil, // Introduced by SE-0469
         priority: TaskPriority? = nil,
         executorPreference taskExecutor: consuming (any TaskExecutor)? = nil,
-        @_inheritActorContext(always) operation: sending @escaping async throws(Failure) -> Success
+        @_inheritActorContext(always) operation: sending @escaping () async throws(Failure) -> Success
     ) -> Task<Success, Failure>
 }
 ```