Gardening some examples (pointfreeco#64)

* Gardening some examples

* Revert variable names

Author: Jager-yoo

Sources/SwiftUINavigation/Documentation.docc/Articles/Bindings.md

@@ -14,7 +14,7 @@ object and synchronizing it to view state with the `bind` view modifier that shi
 library.
 
 For example, suppose you have a sign in flow where if the API request to sign in fails, you want
-to refocus the email field. The model can be implement like so:
+to refocus the email field. The model can be implemented like so:
 
 ```swift
 class SignInModel: ObservableObject {

Sources/SwiftUINavigation/Documentation.docc/Articles/DestructuringViews.md

@@ -36,7 +36,7 @@ struct EditView: View {
           }
         }
       } else: {
-        Text("\(self.string)")
+        Text(self.string)
         Button("Edit") {
           self.editableString = self.string
         }
@@ -47,7 +47,7 @@ struct EditView: View {
 }
 ```
 
-This is the most optimal way to model this domain. Without the ability to deriving a 
+This is the most optimal way to model this domain. Without the ability to derive a 
 `Binding<String>` from a `Binding<String?>` we would have had to hold onto extra state to represent
 whether or not we are in editing mode:
 
@@ -94,15 +94,15 @@ struct EditView: View {
         TextField("Edit string", text: $string)
         HStack {
           Button("Cancel") {
-            self.editableString = nil
+            self.editableString = .inactive
           }
           Button("Save") {
             self.string = string
-            self.editableString = nil
+            self.editableString = .inactive
           }
         }
       } else: {
-        Text("\(self.string)")
+        Text(self.string)
         Button("Edit") {
           self.editableString = .active(self.string)
         }
@@ -136,7 +136,7 @@ enum ItemStatus {
   case outOfStock(isOnBackOrder: Bool)
 }
 
-struct InventoryItemView {
+struct InventoryItemView: View {
   @State var status: ItemStatus
 
   var body: some View {

Sources/SwiftUINavigation/IfCaseLet.swift

@@ -15,7 +15,7 @@ import SwiftUI
 ///   case outOfStock(isOnBackOrder: Bool)
 /// }
 ///
-/// struct InventoryItemView {
+/// struct InventoryItemView: View {
 ///   @State var status: ItemStatus
 ///
 ///   var body: some View {

Sources/SwiftUINavigation/IfLet.swift

@@ -11,7 +11,7 @@ import SwiftUI
 /// optional binding.
 ///
 /// ```swift
-/// struct InventoryItemView {
+/// struct InventoryItemView: View {
 ///   @State var quantity: Int?
 ///
 ///   var body: some View {

Sources/SwiftUINavigation/Switch.swift

@@ -15,7 +15,7 @@ import SwiftUI
 ///   case outOfStock(isOnBackOrder: Bool)
 /// }
 ///
-/// struct InventoryItemView {
+/// struct InventoryItemView: View {
 ///   @State var status: ItemStatus
 ///
 ///   var body: some View {