Update test/rdoc/test_rdoc_any_method.rb

Co-authored-by: Vinicius Stock <[email protected]>

Author: st0012

test/rdoc/test_rdoc_any_method.rb

@@ -236,7 +236,7 @@ def test_marshal_dump
     assert_equal 'Klass#method', loaded.full_name
     assert_equal 'method',       loaded.name
     assert_equal 'param',        loaded.params
-    assert_equal false,          loaded.singleton # defaults to nil
+    assert_equal false,          loaded.singleton
     assert_equal :public,        loaded.visibility
     assert_equal cm,             loaded.parent
     assert_equal section,        loaded.section