content: lesson 7 explanation fix (#865)

course/lesson-7-member-variables/lesson.tres

@@ -169,7 +169,7 @@ script = ExtResource( 5 )
 content_id = "res://course/lesson-7-member-variables/content-iGjB7tKR.tres"
 title = "In games, the Y-axis is positive going down"
 type = 0
-text = "Note that in games, assuming your character's position starts at (0, 0), the code above moves the entity [code]180[/code] pixels to the right and [code]120[/code] pixels down.
+text = "Note that in games, assuming your character's position starts at (0, 0), the code above moves the entity [code]200[/code] pixels to the right and [code]250[/code] pixels down.
 
 In math, the y-axis is generally positive going up by convention.