CSS file does not exist for snackbar examples

[TheKeymaster]

What is the expected behavior?

/** No CSS for this example */

What is the current behavior?

Failed to load document: /assets/examples/snack-bar-component-example-css.html. Error: OK

What are the steps to reproduce?

1. Go to https://material.angular.io/components/snack-bar/examples.
2. Click on "Examples".
3. Click on "View Source".
4. Click on "CSS".

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular Documentation.

Is there anything else we should know?

Nope.

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