Update coroutines-basics.md (Kotlin#3494)

* Fix typo

Author: He-Pin

docs/topics/coroutines-basics.md

@@ -57,7 +57,7 @@ the code with coroutines inside of `runBlocking { ... }` curly braces. This is h
 `this: CoroutineScope` hint right after the `runBlocking` opening curly brace.
 
 If you remove or forget `runBlocking` in this code, you'll get an error on the [launch] call, since `launch`
-is declared only in the [CoroutineScope]:
+is declared only on the [CoroutineScope]:
 
 ```Plain Text
 Unresolved reference: launch