Fix typos/grammar/code examples (#80)

* Fix typos

* Fix grammar

* Fix - Switch statement was not exhaustive

* Fix typo

* Fix typo

* Fix typo

* Fix typo

* Fix typo

* Fix grammar

* Undo switch exhaustiveness

Author: zohairawan

src/instance_methods/challenges.md

@@ -111,7 +111,7 @@ void main() {
 
 ## Challenge 4.
 
-Make a `Rectange` class which has a `width` field and a `height`
+Make a `Rectangle` class which has a `width` field and a `height`
 field. Give it an instance method named `toCharArray` which gives
 a `char[]` that can be printed to display a rectangle of the given
 width and height.

src/multi_file_programs/the_anonymous_main_class.md

@@ -15,7 +15,7 @@ We call it anonymous because we never gave it a name.
 
 We call it the main class because you are only allowed to skip naming a class if it is the one you use to start your program, and that requires a `void main()` method.
 
-If you take any code we've produced up until now and put wrap it with `class Main {}` it will continue to work as-is.
+If you take any code we've produced up until now and wrap it with `class Main {}` it will continue to work as-is.
 
 ```java
 class Main {

src/operating_systems/abstractions.md

@@ -1,6 +1,6 @@
 # Abstractions
 
-The most important jobs of an operating system is to "abstract"
+The most important job of an operating system is to "abstract"
 over the hardware.
 
 You shouldn't need to know what brand network card you have in order

src/operating_systems/defaults.md

@@ -15,7 +15,7 @@ only had text based interfaces. In many practical ways, people were closer to th
 
 So think about that whenever you feel like you have a lot left to learn. A lot of what you do and do not know
 about computers was dictated for you by the fact that you grew up interacting with them on a touch screen
-instead of on a terminal. Things are not as intimiating as they seem.
+instead of on a terminal. Things are not as intimidating as they seem.
 
 [^lawsuit]: https://en.wikipedia.org/wiki/United_States_v._Microsoft_Corp.
 

src/static_methods/factories.md

@@ -18,7 +18,7 @@ class Position {
 ~void main() {}
 ```
 
-It would be reasonable want to add an overloaded constructor for when `y` is `0`.
+It would be reasonable to want to add an overloaded constructor for when `y` is `0`.
 
 ```java
 class Position {

src/strings_ii/UPPERCASE.md

@@ -1,7 +1,7 @@
 # UPPERCASE
 
 Similarly, if you have a `String` which potentially contains lower-cased letters, you can get a new `String` with everything
-transformed into lower-case using the `.toUpperCase()` method.
+transformed into upper-case using the `.toUpperCase()` method.
 
 ```java
 void main() {

src/strings_ii/check_if_blank.md

@@ -2,8 +2,7 @@
 
 You can check if a `String` is blank by using the `.isBlank` method.
 
-The difference is that an empty `String` has actually zero characters. A blank `String`
-is can have characters, so long as those characters are what we would consider whitespace.
+The difference is that an empty `String` has actually zero characters. A blank `String` can have characters, so long as those characters are what we would consider whitespace.
 That is, things like spaces and newlines.
 
 ```java

src/switch/challenges.md

@@ -180,7 +180,7 @@ enum Bear {
 enum Action {
     LAY_DOWN,
     FIGHT_BACK,
-    RUN_AWAY
+    RUN_AWAY,
     YEET
 }
 

src/the_terminal/windows_subsystem_for_linux.md

@@ -7,4 +7,4 @@ Both of these differ in significant ways from bash so, if at all possible, you s
 
 This will let you follow along with the bash snippets you'll see later in this book.[^other_shells]
 
-[^other_shells]: It is certainly possible for me to also include instruction for PowerShell and batch but it doesn't feel practical. I spend most of my working hours using batch and can test commands on the machine I use to write this. It would be hard for me to do that with the Windows specific shells
+[^other_shells]: It is certainly possible for me to also include instruction for PowerShell and batch but it doesn't feel practical. I spend most of my working hours using bash and can test commands on the machine I use to write this. It would be hard for me to do that with the Windows specific shells