docs: Remove next recommendation (#1862)

The `next` flag seems like an artifact for those who are not on the latest VuePress. Since we are on VuePress 1.0, this should not be the default install path

Author: bencodezen

packages/docs/docs/plugin/official/plugin-google-analytics.md

@@ -11,8 +11,8 @@ metaTitle: Google Analytics Plugin | VuePress
 ## Install
 
 ```bash
-yarn add -D @vuepress/plugin-google-analytics@next
-# OR npm install -D @vuepress/plugin-google-analytics@next
+yarn add -D @vuepress/plugin-google-analytics
+# OR npm install -D @vuepress/plugin-google-analytics
 ```
 
 ## Usage