Fix a typo

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62019 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_rational.rb

@@ -560,7 +560,7 @@ class Rational_Test < Test::Unit::TestCase
     assert_equal([Rational(2.2),Rational(1)], Rational(1).coerce(2.2))
     assert_equal([Rational(2),Rational(1)], Rational(1).coerce(Rational(2)))
 
-    assert_nothing_raised(TypeError, '[Bug #5020] [ruby-devl:44088]') do
+    assert_nothing_raised(TypeError, '[Bug #5020] [ruby-dev:44088]') do
       Rational(1,2).coerce(Complex(1,1))
     end
   end