Update 06_StructuredConcurrency.md

Introduction to Coroutines and Channels/06_StructuredConcurrency.md

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 # Structured concurrency
 
 _Coroutine scope_ is responsible for the structure and parent-child relationships between different coroutines.
-We always start new coroutines inside a scope.
+Coroutine builders, like `launch` and `async`, need to be started in some scope. 
 _Coroutine context_ stores additional technical information used to run a given coroutine,
 like the dispatcher specifying the thread or threads the coroutine should be scheduled on.