Fix a test that uses invalid syntax (#1577)

Writing it like this on the same line was never valid. The expected html
also contains the `end` from the class definition, which I think should
not happen.

Author: Earlopain

test/rdoc/parser/ruby_test.rb

@@ -2847,12 +2847,13 @@ def blah()
   def test_parse_instance_operation_method
     util_parser <<-RUBY
 class Foo
-  def self.& end
+  def self.&
+  end
 end
     RUBY
 
     expected = <<EXPECTED
-  <span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">&amp;</span> <span class="ruby-keyword">end</span>
+<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">&amp;</span>
 <span class="ruby-keyword">end</span>
 EXPECTED
     expected = expected.rstrip