chore: remove stale data slot from docs

Author: rohanchkrabrty

apps/www/src/content/docs/components/calendar/index.mdx

@@ -69,7 +69,6 @@ Every rendered part carries a stable `data-slot` attribute for [styling and test
 | `calendar-day-tooltip` | The tooltip shown on hover (when `showTooltip` and a message exists) |
 | `date-picker-trigger` | The `<div>` wrapping the DatePicker trigger |
 | `date-picker-input` | The DatePicker's text `<input>` |
-| `date-picker-error` | The error message (always mounted, toggled via `data-visible`) |
 | `date-picker-positioner` | The popover positioner for the DatePicker |
 | `date-picker-content` | The DatePicker popover content that holds the calendar |
 | `range-picker-trigger` | The `<div>` wrapping the RangePicker trigger |