Improve instructions

Author: iHiD

bootcamp_content/projects/breakout/exercises/bouncy-ball/stub.html

@@ -0,0 +1 @@
+<div></div>

bootcamp_content/projects/snake/exercises/slithery-snake/introduction.md

@@ -11,11 +11,11 @@ This exercise has self-completion. I'd strongly encourage you to try and get you
 
 ## Instructions
 
-Your job is to create a square game area that takes up 80% of the screen and to add a snake that moves around.
+Your job is to create a square game area that takes up 80% of the screen and to add a snake that moves around. For now, you should just get the snake starting in the center moving around the edges.
 
 If you do everything correctly, you should be able to overlay your solution onto mine and it should look and work identically!
 
-You can choose whatever colors your like. Each snake segment in my example solution is `5%` of the game area.
+You can choose whatever colors your like. Each snake segment in my example solution is `5%` of the game area, and it keeps `5%` from the edge of the board.
 
 As long as you don't keep creating unlimited elements, you can safely let the snake move indefinitely.
 

bootcamp_content/projects/snake/exercises/slithery-snake/stub.html

@@ -0,0 +1 @@
+<div></div>

bootcamp_content/projects/space-invaders/exercises/aliens-evolved/introduction.md

@@ -44,6 +44,7 @@ Some points of clarity:
 
 - Every time you move left or right, you move one "position" forward or backwards. That position equates to the places the aliens can be.
 - You cannot shoot twice in a row without moving.
+- The aliens do not move.
 - The aliens do not respawn.
 
 ## Reusing Alien Detector (Coding Fundamentals students)