docs-bug(COMPONENT): Custom input component incorrectly documented

[ashblue]

Documentation Feedback

The example phone input breaks the ability to use <mat-error>. Please update the errorState field from this to this in order to fix it. I spent a whole day trying to figure out why the example wouldn't work with <mat-error>. Hopefully updating this will save some other poor souls some time.

public errorState: boolean = false;

public get errorState(): boolean {
    return this.parts.invalid;
}

Affected documentation page: https://material.angular.io/components/form-field/examples

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