Update the documentation for Gecko-related preferences
Update the documentation for Gecko-related preferences

chrys87/orca-beep,pvagner/orca,chrys87/orca-beep,pvagner/orca,chrys87/orca-beep,GNOME/orca,chrys87/orca-beep,GNOME/orca,GNOME/orca,GNOME/orca,pvagner/orca,pvagner/orca