Deleted redundant word "who"

Author: hmacgregor1

articles/communication-services/concepts/ui-library/includes/mobile-ui-use-cases.md

@@ -72,7 +72,7 @@ The calling composite offers to adapt to any screen size that would bring suppor
 
 ## Localization
 
-Localization is a key to making products that can be used across the world and by people who who speak different languages.
+Localization is a key to making products that can be used across the world and by people who speak different languages.
 
 Localization is a key to making products that can be used across the world. The Mobile UI Library now provides support for 13 languages: ***English, Spanish, French, German, Italian, Japanese, Korean, Dutch, Portuguese, Russian, Turkish and Chinese*** and RTL capabilities.