[textarea] missing icons implementation

[yinonov]

Describe the bug textarea documents icon and trailingicon as part of its API but in practice there's no implementation

https://github.com/material-components/material-web/blob/987a534fe75555a1a6b0854f0f9b9f999d72b7d0/packages/textarea/mwc-textarea-base.ts#L97-L114

Expected behavior textarea should implement icons in template

[asyncliz]

Thanks for the bug! This is definitely a documentation issue since textarea does not have icons.

[yinonov]

couldn't find any ref to textarea in the material.io guidelines. mind sharing the reasons?

[yinonov]

oh there's this reference pointing out textarea as a text field type