doc: fix broken references

There are numerous broken references to Documentation files (in other
Documentation files, in comments, etc.). These broken references are
caused by typo's in the references, and by renames or removals of the
Documentation files. Some broken references are simply odd.

Fix these broken references, sometimes by dropping the irrelevant text
they were part of.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6a47bb2..9a4a267 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -279,7 +279,7 @@
 	  Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
 	  Management" code will be disabled if you say Y here.
 
-	  See also <file:Documentation/i386/IO-APIC.txt>,
+	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
 	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 	  <http://www.tldp.org/docs.html#howto>.