Tailwind docs updated

doc/tristatecheckbox/theming/TailwindDoc.vue

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+<template>
+    <DocSectionText v-bind="$attrs">
+        <p>
+            PrimeVue offers a built-in Tailwind theme to get you started quickly. The default values related to the component are displayed below. The component can easily be styled with your own design based on Tailwind utilities, see the
+            <PrimeVueNuxtLink to="/tailwind">Tailwind Customization</PrimeVueNuxtLink> section for an example.
+        </p>
+        <DocSectionCode :code="code1" hideToggleCode importCode hideCodeSandbox hideStackBlitz />
+        <p>A playground sample with the pre-built Tailwind theme.</p>
+        <DocSectionCode :code="code2" embedded />
+    </DocSectionText>
+</template>
+
+<script>
+export default {
+    data() {
+        return {
+            code1: {
+                basic: `
+export default {
+    tristatecheckbox: {
+        root: {
+            class: ['cursor-pointer inline-flex relative select-none align-bottom', 'w-6 h-6']
+        },
+        checkbox: ({ props }) => ({
+            class: [
+                'flex items-center justify-center',
+                'border-2 w-6 h-6 rounded-lg transition-colors duration-200',
+                {
+                    'border-blue-500 bg-blue-500 text-white dark:border-blue-400 dark:bg-blue-400': props.modelValue || !props.modelValue,
+                    'border-gray-300 text-gray-600 bg-white dark:border-blue-900/40 dark:bg-gray-900': props.modelValue == null
+                },
+                {
+                    'hover:border-blue-500 dark:hover:border-blue-400 focus:outline-none focus:outline-offset-0 focus:shadow-[0_0_0_0.2rem_rgba(191,219,254,1)] dark:focus:shadow-[inset_0_0_0_0.2rem_rgba(147,197,253,0.5)]': !props.disabled,
+                    'cursor-default opacity-60': props.disabled
+                }
+            ]
+        })
+    }
+}
+`
+            },
+            code2: {
+                composition: `
+<template>
+    <div class="card flex flex-col items-center">
+        <TriStateCheckbox v-model="value" />
+        <label for="checkbox" class="text-gray-700 dark:text-white/80 mt-1">{{ value == null ? 'null' : value }}</label>
+    </div>  
+</template>
+
+<script setup>
+import { ref } from 'vue';
+
+const value = ref(null);
+<\/script>`
+            }
+        };
+    }
+};
+</script>