docs: make new component consistent with other components

Author: kirillzyusko

docs/docs/api/components/keyboard-toolbar/index.mdx

@@ -332,7 +332,7 @@ The property that allows to specify custom text for `Done` button.
 </KeyboardToolbar>
 ```
 
-### `KeyboardToolbar.Group`
+### `<KeyboardToolbar.Group>`
 
 This component defines a group of inputs that form an isolated navigation region. When the user presses the prev/next arrows on `KeyboardToolbar`, the focus will only cycle through inputs **within the same group**. Inputs outside the group are not reachable from within, and inputs inside the group are not reachable from outside.