ACPI / doc: linuxized-acpica.txt: fix typos

Fix some typos in the linuxized-acpica.txt document.

Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
[ rjw: Subject / changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>