staging: rtlwifi: replace ---help--- with help in Kconfig

This patch fixes the checkpatch.pl warning:

WARNING: prefer 'help' over '---help---' for new help texts
Signed-off-by: Cezary Kierzyk <virdipravum.n008d3v@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtlwifi/Kconfig

@@ -2,7 +2,7 @@ config R8822BE
 	tristate "Realtek RTL8822BE Wireless Network Adapter"
 	depends on PCI && MAC80211 && m
 	select FW_LOADER
-	---help---
+	help
 	This is the staging driver for Realtek RTL8822BE 802.11ac PCIe
 	wireless network adapters.