docs(material/dialog): fix typo in animation description (#20886)
docs(material/dialog): fix typo in animation description (#20886)

Fixes a typo in the description of dialog container animations file.
crisbeto/material2,mmalerba/material2,josephperrott/material2,mmalerba/material2,andrewseguin/material2,crisbeto/material2,crisbeto/material2,DevVersion/material2,angular/components,mmalerba/material2,andrewseguin/material2,andrewseguin/material2,DevVersion/material2,josephperrott/material2,crisbeto/material2,DevVersion/material2,josephperrott/material2,angular/components,DevVersion/material2,josephperrott/material2,angular/components,josephperrott/material2,andrewseguin/material2,andrewseguin/material2,mmalerba/material2,DevVersion/material2,mmalerba/material2,angular/components