docs: require the latest volar

Author: sxzz

docs/guide/getting-started.md

@@ -8,7 +8,7 @@ We assume you are already familiar with the basic usages of Vue before you conti
 
 - Vue >= 2.7 or Vue >= 3.0.
   - Some features need Vue >= 3.2.25.
-- VSCode with [Volar](https://marketplace.visualstudio.com/items?itemName=Vue.volar) extension.
+- VSCode with the **latest** [Volar](https://marketplace.visualstudio.com/items?itemName=Vue.volar) extension.
   - ❌ WebStorm is not supported.
 
 ## Demos