Outdated soucecodes to actual sourcecodes in Angular documentation

[isybai]

Bug, feature request, or proposal:

Proposal

What is the expected behavior?

Actual sourcecodes in Angular Material documentation https://material.angular.io/components/

What is the current behavior?

Outdated sourcecodes

What are the steps to reproduce?

Replace md to mat

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

It confuses angular beginners

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

latest Angular Material

Is there anything else we should know?

no

[donroyco]

Did you clear your cache?

[jelbourn]

See #8497

Visit chrome://serviceworker-internals/ and unregister the worker for material.angular.io

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