V4L/DVB (5587): Add help for RADIO_ADAPTERS and VIDEO_CAPTURE_DRIVERS

Add a small help for those two new Kconfig vars.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/radio/Kconfig

@@ -6,6 +6,8 @@ menuconfig RADIO_ADAPTERS
 	bool "Radio Adapters"
 	depends on VIDEO_DEV
 	default y
+	---help---
+	  Say Y here to enable selecting AM/FM radio adapters.
 
 if RADIO_ADAPTERS
 

drivers/media/video/Kconfig

@@ -6,6 +6,10 @@ menuconfig VIDEO_CAPTURE_DRIVERS
 	bool "Video capture adapters"
 	depends on VIDEO_DEV
 	default y
+	---help---
+	  Say Y here to enable selecting the video adapters for
+	  webcams, analog TV, and hybrid analog/digital TV.
+	  Some of those devices also supports FM radio.
 
 if VIDEO_CAPTURE_DRIVERS