docs(input): add examples

docs/app/components/content/examples/input/InputClearButtonExample.vue

@@ -0,0 +1,22 @@
+<script setup lang="ts">
+const value = ref('Click to clear')
+</script>
+
+<template>
+  <UInput
+    v-model="value"
+    placeholder="Type something..."
+    :ui="{ trailing: 'pr-0.5' }"
+  >
+    <template v-if="value?.length" #trailing>
+      <UButton
+        color="neutral"
+        variant="link"
+        size="sm"
+        icon="i-heroicons-x-circle"
+        aria-label="Clear input"
+        @click="value = ''"
+      />
+    </template>
+  </UInput>
+</template>