Remove the change code below/above line instructions for Redux challenge:Use const for Action Types

Describe your problem and how to reproduce it: Hi there! This challenge asks users to declare two variables with const and then edit the authReducer() function and action creators. The //change code below/above line instructions imply that your code should only be between those two lines. However, in order to pass the challenge, you have to edit the code below the // Change code above this line. I think it would be best to remove those comments.

Thanks!

Add a Link to the page with the problem: https://www.freecodecamp.org/learn/front-end-libraries/redux/use-const-for-action-types

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[RandellDawson]

Since this is a fairly simple fix, I have open this PR up to first timers only.

[RandellDawson]

@GJ-16 We are not planning on adding any more comments to the current curriculum. We have a specific set of comments located in /curriculum/dictionaries/english/comments.js that we want to stick to at the current time.

We have three specific sets comments we use related to where to put code:

// Only change code below this line

// Only change code above this line

and

// Change code below this line

// Change code above this line

and

// Change this line

My recommendation is to leave the existing comments at the top and add Change this line on the case 'LOGIN': and case 'LOGOUT': lines.