docs: fix typo

Author: meteorlxy

docs/guide/i18n.md

@@ -48,7 +48,7 @@ Config reference: [locales](../reference/config.md#locales)
 
 VuePress does not restrict how themes provide multi-language support, so each theme may have different way to handle i18n, and some themes may not provide multi-language support at all. You'd better refer to the theme documentation for detailed guide.
 
-If you are using default theme, the multi-language support is the same with above:
+If you are using default theme, the multi-language support is the same as above:
 
 ```js
 module.exports = {