Documentation: ACPI: move dsdt-override.txt to admin-guide/acpi and convert to reST

This converts the plain text documentation to reStructuredText format
and adds it to Sphinx TOC tree.

No essential content change.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/Documentation/acpi/dsdt-override.txt b/Documentation/acpi/dsdt-override.txt
deleted file mode 100644
index 784841c..0000000
--- a/Documentation/acpi/dsdt-override.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-Linux supports a method of overriding the BIOS DSDT:
-
-CONFIG_ACPI_CUSTOM_DSDT builds the image into the kernel.
-
-When to use this method is described in detail on the
-Linux/ACPI home page:
-https://01.org/linux-acpi/documentation/overriding-dsdt
diff --git a/Documentation/admin-guide/acpi/dsdt-override.rst b/Documentation/admin-guide/acpi/dsdt-override.rst
new file mode 100644
index 0000000..50bd7f1
--- /dev/null
+++ b/Documentation/admin-guide/acpi/dsdt-override.rst
@@ -0,0 +1,13 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============
+Overriding DSDT
+===============
+
+Linux supports a method of overriding the BIOS DSDT:
+
+CONFIG_ACPI_CUSTOM_DSDT - builds the image into the kernel.
+
+When to use this method is described in detail on the
+Linux/ACPI home page:
+https://01.org/linux-acpi/documentation/overriding-dsdt
diff --git a/Documentation/admin-guide/acpi/index.rst b/Documentation/admin-guide/acpi/index.rst
index 09e4e81..d68e991 100644
--- a/Documentation/admin-guide/acpi/index.rst
+++ b/Documentation/admin-guide/acpi/index.rst
@@ -9,3 +9,4 @@
    :maxdepth: 1
 
    initrd_table_override
+   dsdt-override