Addressing issue #661 and suggesting a consistency update.

[low-perry]

This clears the confusion presented at Issue #661.

//line1
guesses.textContent = `${guesses.textContent} ${userGuess}`;
//line2
guesses.textContent += userGuess + ' ';

The code below line 1 is presented on the tutorial, and line2 on the proposed solution. The change made would somewhat clear the confusion.