Progress-spinner docs site example does not bind color correctly

[mattroll]

Here : https://material.angular.io/components/component/progress-spinner

In the example tab ,changing the color of the progress spinner is not working.

I think it's because in html the attribute is attr.color and in .ts file the attribute is color

[gseabrook]

@jelbourn Is it possible to serve the components example site (https://material.angular.io/components) locally? I can see the gulp tasks for building the documentation but I'm unsure how to test it before raising a PR

[jelbourn]

@gseabrook the docs site lives in https://github.com/angular/material.angular.io/ and is just a basic Angular CLI app. The example setup is a little... weird right now, though.

@devversion has a fix for the issue in #4687

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