docs: improve slots sections

docs/content/3.forms/1.input.md

@@ -142,6 +142,75 @@ excludedProps:
 ---
 ::
 
+## Slots
+
+### `leading`
+
+Use the `#leading` slot to set the content of the leading icon.
+
+::component-card
+---
+slots:
+  leading: <UAvatar src="https://avatars.githubusercontent.com/u/739984?v=4" size="3xs" />
+baseProps:
+  name: 'input'
+  placeholder: 'Search...'
+---
+
+#leading
+  :u-avatar{src="https://avatars.githubusercontent.com/u/739984?v=4" size="3xs"}
+::
+
+### `trailing`
+
+Use the `#trailing` slot to set the content of the trailing icon.
+
+::component-card
+---
+slots:
+  trailing: <span class="text-gray-500 dark:text-gray-400 text-xs">EUR</span>
+baseProps:
+  name: 'input'
+  placeholder: 'Search...'
+---
+
+#trailing
+  [EUR]{class="text-gray-500 dark:text-gray-400 text-xs"}
+::
+
+You can for example create a clearable Input by injecting a [Button](/elements/button) in the `trailing` slot that displays when some text is entered.
+
+::component-example
+#default
+:input-example-clearable
+
+#code
+```vue
+<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>
+```
+::
+
+::alert{icon="i-heroicons-exclamation-triangle-20-solid"}
+As leading and trailing icons are wrapped around a `pointer-events-none` class, if you inject a clickable element in the slot, you need to remove this class to make it clickable by adding `:ui="{ icon: { trailing: { pointer: '' } } }"` to the Input.
+::
+
 ## Props
 
 :component-props