doc: fix wrong arch/i386 references

Change all "arch/i386" to "arch/x86" in Documentaion/,
since the directory has changed.

Also update the files which have changed their filename
in the meantime accordingly.

Signed-off-by: Wanlong Gao <wanlong.gao@gmail.com>
[jkosina@suse.cz: reword changelog]
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/isdn/README.HiSax b/Documentation/isdn/README.HiSax
index 99e87a6..b1a573cf 100644
--- a/Documentation/isdn/README.HiSax
+++ b/Documentation/isdn/README.HiSax
@@ -506,7 +506,7 @@
      <ISDN subsystem - ISDN support -- HiSax>
      make clean; make zImage; make modules; make modules_install
 2. Install the new kernel
-     cp /usr/src/linux/arch/i386/boot/zImage /etc/kernel/linux.isdn
+     cp /usr/src/linux/arch/x86/boot/zImage /etc/kernel/linux.isdn
      vi /etc/lilo.conf
      <add new kernel in the bootable image section>
      lilo