docs: fix minor typo on comment (#15002)
docs: fix minor typo on comment (#15002)

extract individual colors a palette -> extract individual colors from a palette.
crisbeto/material2,angular/components,Jefiozie/material2,josephperrott/material2,josephperrott/material2,crisbeto/material2,crisbeto/material2,josephperrott/material2,josephperrott/material2,DevVersion/material2,mmalerba/material2,andrewseguin/material2,josephperrott/material2,DevVersion/material2,andrewseguin/material2,jelbourn/material2,Jefiozie/material2,angular/components,jelbourn/material2,Jefiozie/material2,jelbourn/material2,andrewseguin/material2,angular/components,Jefiozie/material2,mmalerba/material2,andrewseguin/material2,jelbourn/material2,jelbourn/material2,DevVersion/material2,andrewseguin/material2,Jefiozie/material2,crisbeto/material2,DevVersion/material2,DevVersion/material2,mmalerba/material2,angular/components,mmalerba/material2,mmalerba/material2