boot/xloader: add upstream URL in Config.in help

Signed-off-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

boot/xloader/Config.in

@@ -5,6 +5,8 @@ config BR2_TARGET_XLOADER
 	  The x-loader bootloader. It is mainly used on OMAP-based
 	  platforms.
 
+	  http://omappedia.org/wiki/Linux_OMAP_Kernel_Main
+
 if BR2_TARGET_XLOADER
 config BR2_TARGET_XLOADER_BOARDNAME
 	string "x-loader board name"