[media] cx24120: Fix minor style typo in Kconfig

This patch changes DVB-S/DVB-S2 to the more commonly used
DVB-S/S2 in the description for DVB_CX24120

Signed-off-by: Jemma Denson <jdenson@gmail.com>
Signed-off-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/Kconfig

@@ -228,7 +228,7 @@ config DVB_CX24120
 	depends on DVB_CORE && I2C
 	default m if !MEDIA_SUBDRV_AUTOSELECT
 	help
-	  A DVB-S/DVB-S2 tuner module. Say Y when you want to support this frontend.
+	  A DVB-S/S2 tuner module. Say Y when you want to support this frontend.
 
 config DVB_SI21XX
 	tristate "Silicon Labs SI21XX based"