Documentation: asus-laptop.txt references an obsolete Kconfig item

The CONFIG_X86_UP_APIC option no longer exists. Delete the
reference of it.

Cc: [e-mail]
Signed-off-by: Paul Gortmaker <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

Documentation/laptops/asus-laptop.txt

···
 
   Debugging:
   1) Check whether the Fn+F8 key:
-     a) does not lock the laptop (try disabling CONFIG_X86_UP_APIC or boot with
-        noapic / nolapic if it does)
+     a) does not lock the laptop (try a boot with noapic / nolapic if it does)
      b) generates events (0x6n, where n is the value corresponding to the
         configuration above)
      c) actually works