Fixing typo (#37136)

Removing duplicate "represents"

files/en-us/web/manifest/screenshots/index.md

@@ -76,7 +76,7 @@ These images help users preview your web app's interface and features in app sto
 
     - `form_factor` {{Optional_Inline}}
 
-      - : A string that represents represents the screen shape of a broad class of devices to which the screenshot applies.
+      - : A string that represents the screen shape of a broad class of devices to which the screenshot applies.
         Specify this property only when the screenshot applies to a specific screen layout.
         If `form_factor` is not specified, the screenshot is considered suitable for all screen types.