Add alias to multilingual.md

Additional alias in multilingual.md resolves a 404 error resulting in a link in the multilingual readme.md in the repo.

fixes gohugoio/hugo#4112

content/content-management/multilingual.md

@@ -13,7 +13,7 @@ menu:
     weight: 150
 weight: 150	#rem
 draft: false
-aliases: [/content/multilingual/,/content-management/multilingual/]
+aliases: [/content/multilingual/,/content-management/multilingual/,/tutorials/create-a-multilingual-site/]
 toc: true
 ---