Documentation: acpi: Fix typos

Fix typos in acpi directory to make documentation grammatically correct.

Signed-off-by: Tamara Diaconita <diaconita.tamara@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/acpi/aml-debugger.txt b/Documentation/acpi/aml-debugger.txt
index 5f62aa4..e851cc5 100644
--- a/Documentation/acpi/aml-debugger.txt
+++ b/Documentation/acpi/aml-debugger.txt
@@ -15,7 +15,7 @@
    CONFIG_ACPI_DEBUGGER=y
    CONFIG_ACPI_DEBUGGER_USER=m
 
-   The userspace utlities can be built from the kernel source tree using
+   The userspace utilities can be built from the kernel source tree using
    the following commands:
 
    $ cd tools