Trailing whitespace cleanup

Author: danroth27

docs/02-customize-a-pizza.md

@@ -63,7 +63,7 @@ Update the `@onclick` handler to call the `ShowConfigurePizzaDialog` method inst
 
 Now we need to implement the pizza customization dialog so we can display it when the user selects a pizza. The pizza customization dialog will be a new component that lets you specify the size of your pizza and what toppings you want, shows the price, and lets you add the pizza to your order.
 
-Add a *ConfigurePizzaDialog.razor* file under the *Shared* directory. Since this component is not a separate page, it does not need the `@page` directive. 
+Add a *ConfigurePizzaDialog.razor* file under the *Shared* directory. Since this component is not a separate page, it does not need the `@page` directive.
 
 > Note: In Visual Studio, you can right-click the *Shared* directory in Solution Explorer, then choose *Add* -> *New Item*, then use the *Razor Component* item template.
 
@@ -154,7 +154,7 @@ In Blazor you can use the `@bind` directive attribute to specify a two-way bindi
 <input type="range" min="@Pizza.MinimumSize" max="@Pizza.MaximumSize" step="1" @bind="Pizza.Size"  />
 ```
 
-But if we use `@bind` with no further changes, the behavior isn't exactly what we want. Give it a try and see how it behaves. The update event only fires after the slider is released. 
+But if we use `@bind` with no further changes, the behavior isn't exactly what we want. Give it a try and see how it behaves. The update event only fires after the slider is released.
 
 ![Slider with default bind](https://user-images.githubusercontent.com/1874516/51804870-acec9700-225d-11e9-8e89-7761c9008909.gif)
 
@@ -297,9 +297,9 @@ void CancelConfigurePizzaDialog()
 }
 ```
 
-Now when you click the dialog's Cancel button, `Index.CancelConfigurePizzaDialog` will execute, and then the `Index` component will rerender itself. Since `showingConfigureDialog` is now `false` the dialog will not be displayed. 
+Now when you click the dialog's Cancel button, `Index.CancelConfigurePizzaDialog` will execute, and then the `Index` component will rerender itself. Since `showingConfigureDialog` is now `false` the dialog will not be displayed.
 
-Normally what happens when you trigger an event (like clicking the Cancel button) is that the component that defined the event handler delegate will rerender. You could define events using any delegate type like `Action` or `Func<string, Task>`. Sometimes you want to use an event handler delegate that doesn't belong to a component - if you used a normal delegate type to define the event then nothing will be rendered or updated. 
+Normally what happens when you trigger an event (like clicking the Cancel button) is that the component that defined the event handler delegate will rerender. You could define events using any delegate type like `Action` or `Func<string, Task>`. Sometimes you want to use an event handler delegate that doesn't belong to a component - if you used a normal delegate type to define the event then nothing will be rendered or updated.
 
 `EventCallback` is a special type that is known to the compiler that resolves some of these issues. It tells the compiler to dispatch the event to the component that contains the event handler logic. `EventCallback` has a few more tricks up its sleeve, but for now just remember that using `EventCallback` makes your component smart about dispatching events to the right place.