fixed typo

Author: vadymhimself

docs/exception-handling.md

@@ -377,7 +377,7 @@ import kotlin.coroutines.*
 fun main(args: Array<String>) = runBlocking {
     val supervisor = SupervisorJob()
     with(CoroutineScope(coroutineContext + supervisor)) {
-        // launch the first child -- its exception is ignored for this example (don't do this in practise!)
+        // launch the first child -- its exception is ignored for this example (don't do this in practice!)
         val firstChild = launch(CoroutineExceptionHandler { _, _ ->  }) {
             println("First child is failing")
             throw AssertionError("First child is cancelled")