Improve documentation

Author: dfed

README.md

@@ -127,7 +127,7 @@ func actorQueueOrdering() async {
 
 ### Sending ordered asynchronous tasks to the `@MainActor` from a nonisolated context
 
-Use `MainActor.queue` to send ordered asynchronous tasks to the `@MainActor`’s isolated context from nonisolated or synchronous contexts. Tasks sent to this queue type are guaranteed to begin executing in the order in which they are enqueued. The `MainActor.queue` an `ActorQueue` that runs within the `@MainActor` global context: execution order is guaranteed only until the first [suspension point](https://docs.swift.org/swift-book/LanguageGuide/Concurrency.html#ID639) within the enqueued task. Similarly, code between suspension points is executed atomically, and tasks sent to the `MainActor.queue` can await results from the queue without deadlocking.
+Use `MainActor.queue` to send ordered asynchronous tasks to the `@MainActor`’s isolated context from nonisolated or synchronous contexts. Tasks sent to this queue type are guaranteed to begin executing in the order in which they are enqueued. The `MainActor.queue` is an `ActorQueue` that runs within the `@MainActor` global context: execution order is guaranteed only until the first [suspension point](https://docs.swift.org/swift-book/LanguageGuide/Concurrency.html#ID639) within the enqueued task. Similarly, code between suspension points is executed atomically, and tasks sent to the `MainActor.queue` can await results from the queue without deadlocking.
 
 A `MainActor.queue` can easily execute asynchronous tasks from a nonisolated context in FIFO order:
 ```swift