Correct spelling errors and doubled word.

Author: amartini51

stdlib/public/Concurrency/GlobalActor.swift

@@ -15,7 +15,7 @@ import Swift
 /// A type that represents a globally-unique actor that can be used to isolate
 /// various declarations anywhere in the program.
 ///
-/// A type that conforms to the `GlobalActor` protocol and is marked with the
+/// A type that conforms to the `GlobalActor` protocol and is marked with
 /// the `@globalActor` attribute can be used as a custom attribute. Such types
 /// are called global actor types, and can be applied to any declaration to
 /// specify that such types are isolated to that global actor type. When using

stdlib/public/Concurrency/Task.swift

@@ -99,9 +99,9 @@ extension Task {
   /// creating the task with the correct priority,
   /// depending on the executor's scheduling details.
   ///
-  /// If the task throws an error, this property propogates that error.
+  /// If the task throws an error, this property propagates that error.
   /// Tasks that respond to cancellation by throwing `Task.CancellationError`
-  /// have that error propogated here upon cancellation.
+  /// have that error propagated here upon cancellation.
   ///
   /// - Returns: The task's result.
   public var value: Success {
@@ -595,7 +595,7 @@ extension Task where Failure == Error {
   /// Runs the given throwing operation asynchronously
   /// as part of a new top-level task.
   ///
-  /// If the operation throws an error, this method propogates that error.
+  /// If the operation throws an error, this method propagates that error.
   ///
   /// Don't use a detached task if it's possible
   /// to model the operation using structured concurrency features like child tasks.

stdlib/public/Concurrency/TaskGroup.swift

@@ -133,7 +133,7 @@ public func withTaskGroup<ChildTaskResult, GroupResult>(
 /// Throwing an error in one of the tasks of a task group
 /// doesn't immediately cancel the other tasks in that group.
 /// However,
-/// if you call `next()` in the task group and propogate its error,
+/// if you call `next()` in the task group and propagate its error,
 /// all other tasks are canceled.
 /// For example, in the code below,
 /// nothing is canceled and the group doesn't throw an error:
@@ -744,7 +744,7 @@ extension TaskGroup: AsyncSequence {
     /// appear in the order that the tasks *completed*,
     /// not in the order that those tasks were added to the task group.
     /// After this method returns `nil`,
-    /// this iterater is guaranteed to never produce more values.
+    /// this iterator is guaranteed to never produce more values.
     ///
     /// For more information about the iteration order and semantics,
     /// see `TaskGroup.next()`.
@@ -831,7 +831,7 @@ extension ThrowingTaskGroup: AsyncSequence {
     /// appear in the order that the tasks *completed*,
     /// not in the order that those tasks were added to the task group.
     /// After this method returns `nil`,
-    /// this iterater is guaranteed to never produce more values.
+    /// this iterator is guaranteed to never produce more values.
     ///
     /// For more information about the iteration order and semantics,
     /// see `ThrowingTaskGroup.next()`