fix(curriculum): hint in step 46 of platformer game (#53970)

Co-authored-by: Jessica Wilkins <67210629+jdwilkin4@users.noreply.github.com>
Co-authored-by: Huyen Nguyen <25715018+huyenltnguyen@users.noreply.github.com>

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-intermediate-oop-by-building-a-platformer-game/64acf287857bb38e6dd7ca69.md

@@ -15,7 +15,7 @@ You need to use the `proportionalSize` function here to make sure the player's `
 
 # --hints--
 
-You should have an `if` statement that checks if the right key was pressed and the player's `x` position is less than `proportionalSize(400)`.
+You should have an `if` statement that checks if the right key was pressed and the player's `x` position is less than `proportionalSize(400)`. Remember that the `this` keyword should not be used here because that is only for the `Player` class and not for the `player` object.
 
 ```js
 assert.match(animate.toString(), /keys\.rightKey\.(pressed|pressed\s*===\s*true)\s*&&\s*player\.position\.x\s*<\s*proportionalSize\(\s*400\s*\)/);