Small doc fixes and many tiny edits. (#439)

docs/courses/csintro/coordinates/activity.md

@@ -6,7 +6,7 @@ Guide the students to create programs using coordinates and LEDs. Each of these
 * Random Patterns generator - A short exercise using a loop to generate random LED patterns and then checking the status of a specific LED.
 * Brightness - A short exercise in using the brightness settings for the micro:bit LEDs.
 
-## Smile Animation
+## Smile animation
 
 A short exercise in plotting and toggling LEDs to create a simple animation.
 * Though students can use the 'show leds' block for images and animation, there is another way to tell the micro:bit what LEDs to turn on and off using coordinates.
@@ -79,7 +79,7 @@ led.plot(3, 3)
 * Add a third image to the animation, perhaps a frown face. 
 * Make your own custom animation! What LEDs stay the same and which need to be toggled?
  
-## Random Patterns generator
+## Random patterns generator
 A short exercise using a loop to generate random LED patterns and then checking the status of a specific LED.
 Pseudocode:
 * On button A pressed we’ll use a loop to turn on a random set of LED lights on our micro:bit. 
@@ -129,7 +129,7 @@ input.onButtonPressed(Button.B, () => {
 })
 ```
 
-Try it out!
+### Try it out!
 * Download the program to your micro:bit
 * Press button A to create a random pattern
 * Press button B to check and display the status of the specific LED
@@ -193,6 +193,6 @@ led.setBrightness(255)
 basic.showIcon(IconNames.Heart)
 ```
 
-Try it out!
+### Try it out!
 
 * What happens if adding 25 or subtracting 25 from the current brightness level would result in a sum or difference outside of the 0 to 255 brightness range? 

docs/courses/csintro/coordinates/project.md

@@ -11,7 +11,7 @@ Your task is to create:
 
 1. A "screen saver" animation using the plot/unplot blocks. You can fill the screen line by line, pausing between each one, or fill it with a random constellation of stars. 
 
-OR
+>-- OR --
 
 1. A game that uses sprites to manage the x and y coordinate values of the different objects.
 
@@ -19,7 +19,7 @@ Your project might use variables to store the values of sprites, which are speci
 
 ## Project Ideas
 
-### Firework Screensaver
+### Firework screensaver
 
 This project uses a for loop with the plot/unplot blocks to create a symmetrical design on the screen. This student used a subtraction operation to get a variable that decreases as the index variable in the loop increases.
 
@@ -40,7 +40,7 @@ basic.forever(() => {
 })
 ```
 
-### Cascade Screensaver
+### Cascade screensaver
 
 This example creates a diagonal cascading effect across the screen. Note the use of a variable (speed) to allow you to easily change the speed of the animation by changing just one number value.
 
@@ -81,7 +81,7 @@ basic.forever(() => {
 speed = 10
 ```
 
-### Dodge Ball Game 
+### Dodge ball game 
 This is a Dodge Ball game that uses one sprite (dodger) to try to avoid another sprite (ball). You use the A and B buttons to move the dodger to avoid the balls that are falling from the top of the screen.
 
 Here is the complete Dodge Ball program.

docs/courses/csintro/coordinates/unplugged.md

@@ -36,7 +36,7 @@ Since their grid is only one quarter the size of the original Battleship grid, s
 
 The game can be played with just paper and pencils or you could use small tokens and markers, like coins, buttons, or paper clips to represent the ships.
  
-Notes
+### Notes:
 * Place students’ grids in sheet protectors or laminate them so they can be used again and again with white board (dry erase) markers.
 * The official rules of Battleship are easily found on the internet. Modify them as needed for your particular class.