qtnfmac: use 'help' in Kconfig

Fix checkpatch warning: use preferred 'help' option in Kconfig.
Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/Kconfig

 config WLAN_VENDOR_QUANTENNA
 	bool "Quantenna wireless cards support"
 	default y
-	---help---
+	help
 	  If you have a wireless card belonging to this class, say Y.
 
 	  Note that the answer to this question doesn't directly affect the

drivers/net/wireless/quantenna/qtnfmac/Kconfig

@@ -11,7 +11,7 @@ config QTNFMAC_PEARL_PCIE
 	select QTNFMAC
 	select FW_LOADER
 	select CRC32
-	---help---
+	help
 	  This option adds support for wireless adapters based on Quantenna
 	  802.11ac QSR10g (aka Pearl) FullMAC chipset running over PCIe.