text: 
  
  TITLE
  Fix a broken link in documentation
  
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  BODY
  # What does this PR do?
  
  Fixes a broken link to the BERTology example in documentation
  
  Fixes #9100 
  
  ## Before submitting
  - [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
  
  ## Who can review?
  
   documentation: @sgugger 
  