message: Doc tweak for dialog.
diff: @@ -81,8 +81,8 @@ By default, the Dialog component implements the design and interactions defined
  | Prop name | Type | Default | Description |
  | :------------ | :--------------------------------------------- | :--------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  -| title | `string` | `"Dialog"` | Required. Sets the title of the dialog, which by default is also used as the `aria-labelledby` attribute. |
  -| subtitle | `string` | `string` | Optional. Sets the subtitle of the dialog, which by default is also used as the `aria-describedby` attribute. |
  +| title | `string` | `"Dialog"` | Sets the title of the dialog, which by default is also used as the `aria-labelledby` attribute. |
  +| subtitle | `string` | | Optional. Sets the subtitle of the dialog, which by default is also used as the `aria-describedby` attribute. |
  | renderHeader | `(props: DialogHeaderProps) => JSX.Element` | | Optional. Custom render the dialog header. See "Custom rendering" above for more info. |
  | renderBody | `(props: DialogProps) => JSX.Element` | | Optional. Custom render the dialog body. See "Custom rendering" above for more info. |
  | renderFooter | `(props: DialogProps) => JSX.Element` | | Optional. Custom render the dialog footer. See "Custom rendering" above for more info. |
  