Apply suggestions from code review

Jinjiang · web-flow · commit da276d65bc05 · 2023-03-07T11:18:56.000+08:00
diff --git a/src/v2/guide/installation.md b/src/v2/guide/installation.md
@@ -71,7 +71,7 @@ NPM is the recommended installation method when building large scale application
 
 ``` bash
 # latest stable
-$ npm install vue@2
+$ npm install vue@^2
 ```
 
 ## CLI
