docs: update layout

Author: dgarcia360

docs/customization/layout.mdx

@@ -32,6 +32,7 @@ The table below lists all the available properties you can set:
 | `hide-privacy-policy` | **Type**: `boolean`<br />**Default value**: `true`<br /><br />Whether to hide the privacy policy checkbox. |
 | `hide-ratings`        | **Type**: `boolean`<br />**Default value**: `false` <br /><br /> Wether to hide the ratings input. |
 | `hide-screenshot-button` | **Type**: `boolean`<br />**Default value**: `false`<br /><br />Whether to hide the screenshot button.|
+| `is-email-required` | **Type**: `boolean`<br />**Default value**: `false`<br /><br />When set to `true`, users must provide an email address to submit feedback. Tip: Remember to also update the [`email-placeholder`](text) property to remove "(optional)" from the text when using this option. |
 | `modal-position`       | **Type**: `string`<br />**Default value**: `center`<br />**Available values:** `center`, `sidebar-right`, `sidebar-left`, `top-right`, `top-left`, `bottom-right`, `bottom-left`, `center-right`, `center-left`<br /><br />Position of the feedback modal.|
 | `rating`              | **Type**: `number`<br />**Default value**: -1 (neutral) <br /><br /> Rating selected by default. **Available values:** `stars` mode: 1...5. `thumbs` mode: `0` dislike and `1` like. `-1` means neutral in both modes. |
 | `rating-mode`         | **Type**: `string`<br />**Default value**: `thumbs` <br /><br /> **Available values:** `thumbs`, `stars`<br /><br />Type of rating system.|