docs: add example of inlined css for <Style> component (#2910)

docs/content/3.docs/1.usage/3.meta-tags.md

@@ -42,6 +42,7 @@ For example:
         <Title>{{ dynamic }} title</Title>
         <Meta name="description" :content="`My page's ${dynamic} description`" />
         <Link rel="preload" href="/test.txt" as="script" />
+        <Style type="text/css" :children="styleString" />
       </Head>
     </Html>
 
@@ -53,7 +54,7 @@ For example:
 
 <script>
 export default {
-  data: () => ({ dynamic: 49 })
+  data: () => ({ dynamic: 49, styleString: 'body { background-color: green; }' })
 }
 </script>
 ```