* lib/rdoc: Update to RDoc 4.1.0.preview.1

RDoc 4.1.0 contains a number of enhancements including a new default
  style and accessibility support.  You can see the changelog here:

  https://github.com/rdoc/rdoc/blob/v4.1.0.preview.1/History.rdoc

* test/rdoc:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42971 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/rdoc/test_rdoc_cross_reference.rb

@@ -19,9 +19,10 @@ class TestRDocCrossReference < XrefTestCase
   def test_METHOD_REGEXP_STR
     re = /#{RDoc::CrossReference::METHOD_REGEXP_STR}/
 
-    re =~ '==='
-
-    assert_equal '===', $&
+    %w'=== [] []= << >>'.each do |x|
+      re =~ x
+      assert_equal x, $&
+    end
   end
 
   def test_resolve_C2