Update TROUBLESHOOT.md

doc/leak_tracking/TROUBLESHOOT.md

@@ -21,7 +21,7 @@ Follow the rules to avoid/fix notGCed and notDisposed leaks:
  release the references before the owner disposed the object.
 
 **Flutter specific rules:**
-1. If a widget creates disposables (loke controller), it should be stateful, to be able to dispose the disposables.
+1. If a widget creates disposables (like controller), it should be stateful, to be able to dispose the disposables.
 
 **Test specific rules:**
 1. If your test creates a disposable object, it should dispose it in `tearDown`, so that test failure does not result in a leak: