docs(slideover): update

docs/app/components/content/examples/slideover/SlideoverExample.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+const slideover = useSlideover()
+
+defineProps<{
+  count: number
+}>()
+</script>
+
+<template>
+  <USlideover :description="`This slideover was opened programmatically ${count} times`">
+    <template #body>
+      <Placeholder class="h-full" />
+    </template>
+
+    <template #footer>
+      <UButton color="gray" label="Close" @click="slideover.close()" />
+    </template>
+  </USlideover>
+</template>