Clarified 1 test name and 2 test expected values.

[markevan100]

Hi,

Thank you so much for the Turing ruby-exerecises, I have been working through them and they are a terrific resource. Here are a few updates I think would be helpful. This is my first open source pr, please let me know if there is anything I can clarify or should change.

In the mad_lib_test.rb, the test_it_can_create_a_different_mad_lib gives new values for the methods but currently expects the same return as the first test. I have updated the expected value:

    expected = "Do you walk your blue dog quickly? That's hilarious!"
    expected = "Do you pet your purple capybara intensely? That's hilarious!"

In the retirement_test.rb, the test_it_tells_me_when_i_should_retire_with_different_ages currently gives the same ages and expects the same return as the previous test. I have updated both the provided values and the expected return:

    result = retire.calculate(25, 65)
    expected = "You have 40 years left until you can retire. It is 2015, so you can retire in 2055."
    result = retire.calculate(39, 70)
    expected = "You have 31 years left until you can retire. It is 2015, so you can retire in 2046."

Lastly, in string_comparison_test.rb, there is currently a test titled test_the_name_number. This test is designed to test the same number as a float and as an integer, so I have updated the name of the test to test_the_same_number.

Thank you so much for maintaining this great resource.

[BrianZanti]

Thanks for this, Mark!