fix group syntax

Author: christian-bromann

index.bs

@@ -5634,13 +5634,13 @@ The <dfn export for=commands>emulation.setGeolocationOverride</dfn> command modi
         ? userContexts: [+browser.UserContext],
       )
 
-      emulation.SetGeolocationOverrideSuccessParameters = {
+      emulation.SetGeolocationOverrideSuccessParameters = (
         coordinates: emulation.GeolocationCoordinates / null
-      } & emulation.SetGeolocationOverrideBaseParameters
+      ) & emulation.SetGeolocationOverrideBaseParameters
 
-      emulation.SetGeolocationOverrideErrorParameters = {
+      emulation.SetGeolocationOverrideErrorParameters = (
         error: emulation.GeolocationPositionError
-      } & emulation.SetGeolocationOverrideBaseParameters
+      ) & emulation.SetGeolocationOverrideBaseParameters
 
       emulation.GeolocationCoordinates = {
          latitude: -90.0..90.0,