title: Return to a fragment by using popBackStack
body: <p>Lets assume that I have a bunch of fragments.</p>
  
  <p>A->B->C->D....->K->L</p>
  
  <p>On Fragment L, I want to return to fragment D directly by popping the fragments between these two. I assume that I need to use popBackStack(String name, int arg1) but I can't seem to understand the information that this method requires from me with the "name" parameter.</p>
  
  <p>Documentation says: "If non-null, this is the name of a previous back state to look for". The name is clearly not the name of my destination fragment (e.g FragmentD). Can you please explain the usage of this method?</p>