docs: fix vue example

examples/nuxt-example/components/ui/sheet/SheetHeader.vue

@@ -0,0 +1,16 @@
+<script setup lang="ts">
+import type { HTMLAttributes } from 'vue'
+import { cn } from '@/lib/utils'
+
+const props = defineProps<{ class?: HTMLAttributes['class'] }>()
+</script>
+
+<template>
+  <div
+    :class="
+      cn('flex flex-col gap-y-2 text-center sm:text-left', props.class)
+    "
+  >
+    <slot />
+  </div>
+</template>