remove Documentation/smp.txt

After seeing the filename I'd have expected something about the
implementation of SMP in the Linux kernel - not some notes on kernel
configuration and building trivialities noone would search at this
place.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Alan Cox <alan@redhat.com>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7109037..56e7e91 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -204,8 +204,7 @@
 	  Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
 	  Management" code will be disabled if you say Y here.
 
-	  See also the <file:Documentation/smp.txt>,
-	  <file:Documentation/i386/IO-APIC.txt>,
+	  See also <file:Documentation/i386/IO-APIC.txt>,
 	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 	  <http://www.tldp.org/docs.html#howto>.