Update article.md

Author: vmasterov

1-js/06-advanced-functions/05-global-object/article.md

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 # Global object
 
-The global object provides variables and functions that are available anywhere. Mostly, the ones that are built into the language or the host environment.
+The global object provides variables and functions that are available anywhere. Mostly, the ones that are built into the language or the host environment1.
 
 In a browser it is named "window", for Node.js it is "global", for other environments it may have another name.