Kbuild/doc: fix links to Documentation files

Fix links to files in Documentation/* in various Kconfig files

Signed-off-by: Dirk Hohndel <hohndel@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/arm/mach-ixp2000/Kconfig b/arch/arm/mach-ixp2000/Kconfig
index 86f53f8..08d2707 100644
--- a/arch/arm/mach-ixp2000/Kconfig
+++ b/arch/arm/mach-ixp2000/Kconfig
@@ -14,7 +14,7 @@
 	help
 	  Say 'Y' here if you want your kernel to support the Radisys
 	  ENP2611 PCI network processing card. For more information on
-	  this card, see <file:Documentation/arm/ENP2611>.
+	  this card, see <file:Documentation/arm/IXP2000>.
 
 config ARCH_IXDP2400
 	bool "Support Intel IXDP2400"