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/serial/computone.txt b/Documentation/serial/computone.txt
index c57ea47..60a6f65 100644
--- a/Documentation/serial/computone.txt
+++ b/Documentation/serial/computone.txt
@@ -87,7 +87,7 @@
 	   edit /usr/src/linux/drivers/char/ip2.c  
            (Optional - may be specified on kernel command line now)
 d) Run "make zImage" or whatever target you prefer.
-e) mv /usr/src/linux/arch/i386/boot/zImage to /boot.
+e) mv /usr/src/linux/arch/x86/boot/zImage to /boot.
 f) Add new config for this kernel into /etc/lilo.conf, run "lilo"
 	or copy to a floppy disk and boot from that floppy disk.
 g) Reboot using this kernel