docs: improve slots sections

docs/components/content/examples/InputExampleClearable.vue

@@ -0,0 +1,18 @@
+<template>
+  <UInput v-model="q" name="q" placeholder="Search..." icon="i-heroicons-magnifying-glass-20-solid" :ui="{ icon: { trailing: { pointer: '' } } }">
+    <template #trailing>
+      <UButton
+        v-show="q !== ''"
+        color="gray"
+        variant="link"
+        icon="i-heroicons-x-mark-20-solid"
+        :padded="false"
+        @click="q = ''"
+      />
+    </template>
+  </UInput>
+</template>
+
+<script setup lang="ts">
+const q = ref('')
+</script>