Grammatical correction (#698)

* Grammatical correction & Fixed broken link

Author: armansimonyan13

docs/channels.md

@@ -179,7 +179,7 @@ fun CoroutineScope.produceNumbers() = produce<Int> {
 </div>
 
 And another coroutine or coroutines are consuming that stream, doing some processing, and producing some other results.
-In the below example the numbers are just squared:
+In the example below, the numbers are just squared:
 
 <div class="sample" markdown="1" theme="idea" data-highlight-only>
 
@@ -219,7 +219,7 @@ Done!
 -->
 
 > All functions that create coroutines are defined as extensions on [CoroutineScope],
-so that we can rely on [structured concurrency](https://github.com/Kotlin/kotlinx.coroutineskotlinx.coroutines/blob/master/docs/composing-suspending-functions.md#structured-concurrency-with-async) to make
+so that we can rely on [structured concurrency](https://kotlinlang.org/docs/reference/coroutines/composing-suspending-functions.html#structured-concurrency-with-async) to make
 sure that we don't have lingering global coroutines in our application.
 
 ### Prime numbers with pipeline

docs/coroutine-context-and-dispatchers.md

@@ -52,7 +52,7 @@ Coroutine context includes a _coroutine dispatcher_ (see [CoroutineDispatcher])
 the corresponding coroutine uses for its execution. Coroutine dispatcher can confine coroutine execution 
 to a specific thread, dispatch it to a thread pool, or let it run unconfined. 
 
-All coroutines builders like [launch] and [async] accept an optional 
+All coroutine builders like [launch] and [async] accept an optional 
 [CoroutineContext](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines.experimental/-coroutine-context/) 
 parameter that can be used to explicitly specify the dispatcher for new coroutine and other context elements.