docs-bug(COMPONENT): mat-chip color not working

### Documentation Feedback

mat-chip color is not being set.

In the Icons chips avatar example one mat-chip color is set to primary and the other is set to accent yet they are all grey in the example

### Affected documentation page

https://material.angular.io/components/chips/overview#icons

Open the affected documentation page and inspect the Icons chips avatar example, focusing on the mat-chip elements assigned primary and accent colors. Confirm the example renders those colors instead of grey, and verify the corrected example in the documentation preview.

索引モデルが issue の本文から書いたものです。