Minor typo fixes (kodecocodes#242)

Author: jawwad

README.markdown

@@ -208,15 +208,15 @@ class MyViewController: UIViewController, UITableViewDataSource, UIScrollViewDel
 }
 ```
 
-Since the compiler does not allow you to re-declare protocol conformance in a derived class, it is not always required to replicate the extension groups of the base class. This is especially true if the derived class is a terminal class and a small number of methods are being overriden. When to preserve the extension groups is left to the discretion of the author.
+Since the compiler does not allow you to re-declare protocol conformance in a derived class, it is not always required to replicate the extension groups of the base class. This is especially true if the derived class is a terminal class and a small number of methods are being overridden. When to preserve the extension groups is left to the discretion of the author.
 
 For UIKit view controllers, consider grouping lifecycle, custom accessors, and IBAction in separate class extensions.
 
 ### Unused Code
 
 Unused (dead) code, including Xcode template code and placeholder comments should be removed. An exception is when your tutorial or book instructs the user to use the commented code.
 
-Aspirational methods not directly associated with the tutorial whose implementation simply calls the super class should also be removed. This includes any empty/unused UIApplicationDelegate methods.
+Aspirational methods not directly associated with the tutorial whose implementation simply calls the superclass should also be removed. This includes any empty/unused UIApplicationDelegate methods.
 
 **Not Preferred:**
 ```swift
@@ -794,7 +794,7 @@ while i < attendeeList.count {
 
 ## Golden Path
 
-When coding with conditionals, the left hand margin of the code should be the "golden" or "happy" path. That is, don't nest `if` statements. Multiple return statements are OK. The `guard` statement is built for this.
+When coding with conditionals, the left-hand margin of the code should be the "golden" or "happy" path. That is, don't nest `if` statements. Multiple return statements are OK. The `guard` statement is built for this.
 
 **Preferred:**
 ```swift