fix a typo in comment [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48345 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

sample/test.rb

@@ -813,7 +813,7 @@ test_ok(catch(:foo) {
 	 break
        end
        break
-       test_ok(false)			# should no reach here
+       test_ok(false)			# should not reach here
      end
      false
    })