Update test/rdoc/test_rdoc_generator_darkfish.rb

Co-authored-by: Stan Lo <[email protected]>

Author: p8

test/rdoc/test_rdoc_generator_darkfish.rb

@@ -521,7 +521,6 @@ def test_canonical_url_for_index
     content = File.binread("index.html")
 
     assert_include(content, '<link rel="canonical" href="https://docs.ruby-lang.org/en/master/">')
-
   end
 
   def test_canonical_url_for_classes