The Documentation for table footer has a error displaying total

[raheelshah31]

Bug, feature request, or proposal:

Document correction

What is the expected behavior?

Should show the total in the total footer row

What is the current behavior?

missing the curley braced for interpreting getTotalCost()

What are the steps to reproduce?

https://stackblitz.com/angular/xaayjyvabqek?file=app%2Ftable-footer-row-example.ts

What is the use-case or motivation for changing an existing behavior?

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

Is there anything else we should know?

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