update docs (#264)

Author: hong4rc

docs/installation.md

@@ -54,7 +54,7 @@ import { createApp } from 'vue'
 import { createI18n } from 'vue-i18n'
 
 const i18n = createI18n({
-  // shomething vue-i18n options here ...
+  // something vue-i18n options here ...
 })
 
 const app = createApp({