doc: mark global object as legacy

Author: mertcanaltin

doc/api/globals.md

@@ -509,7 +509,7 @@ added: v0.1.27
 
 <!-- type=global -->
 
-> Stability: 3 - Legacy. use [`globalThis`][] instead.
+> Stability: 3 - Legacy. Use [`globalThis`][] instead.
 
 * {Object} The global namespace object.