Fix typo in gettingstarted/subjects.md

doc/gettingstarted/subjects.md

@@ -76,4 +76,4 @@ setTimeout(function () {
 
 The `Subject` object in the RxJS library is a basic implementation, but you can create your own using  the [`Subject.create`](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/subjects/subject.md#rxsubjectcreateobserver-observable) method. There are other implementations of Subjects that offer different functionalities. All of these types store some (or all of) values pushed to them via onNext, and broadcast it back to its observers. In this way, they convert a Cold Observable into a Hot one. This means that if you Subscribe to any of these more than once (i.e. subscribe -> unsubscribe -> subscribe again), you will see at least one of the same value again. For more information on hot and cold observables, see the last section of the [Creating and Subscribing to Simple Observable Sequences](creating.md) topic.
 
-[`ReplaySubject`](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/subjects/replaysubject.md) stores all the values that it has published. Therefore, when you subscribe to it, you automatically receive an entire history of values that it has published, even though your subscription might have come in after certain values have been pushed out. [`BehaviorSubject`](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/subjects/behaviorsubject.md) is similar to `ReplaySubject`, except that it only stored the last value it published. `BehaviourSubject` also requires a default value upon initialization. This value is sent to observers when no other value has been received by the subject yet. This means that all subscribers will receive a value instantly on `subscribe`, unless the `Subject` has already completed. [`AsyncSubject`](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/subjects/asyncsubject.md) is similar to the Replay and Behavior subjects, however it will only store the last value, and only publish it when the sequence is completed. You can use the `AsyncSubject` type for situations when the source observable is hot and might complete before any observer can subscribe to it. In this case, `AsyncSubject` can still provide the last value and publish it to any future subscribers.
+[`ReplaySubject`](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/subjects/replaysubject.md) stores all the values that it has published. Therefore, when you subscribe to it, you automatically receive an entire history of values that it has published, even though your subscription might have come in after certain values have been pushed out. [`BehaviorSubject`](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/subjects/behaviorsubject.md) is similar to `ReplaySubject`, except that it only stored the last value it published. `BehaviorSubject` also requires a default value upon initialization. This value is sent to observers when no other value has been received by the subject yet. This means that all subscribers will receive a value instantly on `subscribe`, unless the `Subject` has already completed. [`AsyncSubject`](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/subjects/asyncsubject.md) is similar to the Replay and Behavior subjects, however it will only store the last value, and only publish it when the sequence is completed. You can use the `AsyncSubject` type for situations when the source observable is hot and might complete before any observer can subscribe to it. In this case, `AsyncSubject` can still provide the last value and publish it to any future subscribers.