General Cleaning

Reworded clumsy sentences, deleted whitespace, fixed typos, removed some back-quotes to improve consistency with other documentation.

exercises/concept/ellens-alien-game/.docs/hints.md

@@ -23,7 +23,7 @@
 ## 5. The `collision_detection` Method
 
 - Remember that object methods are always passed `self` as the first parameter.
-- If you wish to 'pass' on completing a method, Python has a keyword for that.
+- This method seems like an excellent place to use some kind of placeholder.
 
 ## 6. Alien Counter
 
@@ -32,5 +32,5 @@
 ## 7. Object Creation
 
 - A tuple would be a _single_ parameter.
-- Alien takes 2 parameters.
+- The Alien constructor takes 2 parameters.
 - Unpacking what is _inside_ the tuple might be closer to what you need.

exercises/concept/ellens-alien-game/.docs/instructions.md

@@ -24,10 +24,9 @@ Now, each alien should be able to internally keep track of it's own position and
 
 ## 2. The `hit` Method
 
-Ellen would like the Alien `class` to have a `hit method` that decrements the health of an alien object by 1 when called.
+Ellen would like the Alien `class` to have a `hit` method that decrements the health of an alien object by 1 when called.
 This way, she can simply call `<alien>.hit()` instead of having to manually change an alien's health.
 
-
 ```python
 >>> alien = Alien(0, 0)
 >>> alien.health
@@ -44,7 +43,7 @@ This way, she can simply call `<alien>.hit()` instead of having to manually chan
 ## 3. The `is_alive` Method
 
 You realize that if the health keeps decreasing, at some point it will probably hit 0 (or even less!).
-It would be a good idea to add an `is_alive method` that Ellen can quickly call to check if the alien is... well... alive.  😉
+It would be a good idea to add an `is_alive` method that Ellen can quickly call to check if the alien is... well... alive. 😉
 `<alien>.is_alive()` should return a boolean.
 
 ```python
@@ -62,7 +61,7 @@ False
 ## 4. The `teleport` Method
 
 In Ellen's game, the aliens have the ability to teleport!
-You will need to write a `teleport method` that takes new `x_coordinate` and `y_coordinate` values, and changes the alien's coordinates accordingly.
+You will need to write a `teleport` method that takes new `x_coordinate` and `y_coordinate` values, and changes the alien's coordinates accordingly.
 
 ```python
 >>> alien.teleport(5, -4)
@@ -76,9 +75,9 @@ You will need to write a `teleport method` that takes new `x_coordinate` and `y_
 
 Obviously, if the aliens can be hit by something, then they need to be able to detect when such a collision has occurred.
 However, collision detection algorithms can be tricky, and you do not yet know how to implement one.
-Ellen has said that she will do it later, but she would still like the `method` to appear in the `class` as a reminder to build out the functionality.
+Ellen has said that she will do it later, but she would still like the `collision_detection` method to appear in the class as a reminder to build out the functionality.
 It will need to take a variable of some kind (probably another object), but that's really all you know.
-You will need to make sure that putting in the `method` definition into the `class` doesn't cause any errors when called:
+You will need to make sure that putting the method definition into the class doesn't cause any errors when called:
 
 ```python
 >>> alien.collision_detection(other_object)
@@ -109,7 +108,7 @@ For example:
 
 ## 7. Object Creation
 
-Ellen loves what you've done so far, but she has a favor to ask.
+Ellen loves what you've done so far, but she has one more favor to ask.
 She would like a standalone function that will create a `list` of alien objects, given a list of positions (as `tuples`).
 
 For example: