Fixes  def test_if_then_else_statements -
def test_if_statements_with_no_else_with_false_condition_return_value

* I learned that when statements objects that return one value if true and 
another if false will return true.

* Every statement in Ruby will return a value, not just if statements.

[#65851856]
Fixes through the end of file about_control_statements.rb

* I learned that unless, while, break, if, next and for statements can 
also be tested to return a value.

[#65851856]