Fix some spelling typos

Lift/Jar.swift

@@ -18,7 +18,7 @@ import Foundation
 /// For a value to be liftable it must conform to `Liftable` or `JarConvertible`
 public struct Jar {
     internal var object: Object
-    internal var key: () -> String = { "" } // Capturing of the current key used for lazy evalution (to avoid a peformance hit for happy cases)
+    internal var key: () -> String = { "" } // Capturing of the current key used for lazy evaluation (to avoid a peformance hit for happy cases)
     public var context: Context = []
 }
 

README.md

@@ -550,7 +550,7 @@ struct LiftError: Error {
 }
 ```
 
-Because the context and key-path are really valuable during debugging, it's important to not loose those when throwing validation errors. Hence, Lift has added assert helper methods to `Jar` that you should use:
+Because the context and key-path are really valuable during debugging, it's important to not lose those when throwing validation errors. Hence, Lift has added assert helper methods to `Jar` that you should use:
 
 ```swift
 init(jar: Jar) throws {