Documentation: PCI: convert acpi-info.txt to reST

Convert plain text documentation to reStructuredText format and add it to
Sphinx TOC tree.  No essential content change.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/PCI/acpi-info.rst

@@ -1,4 +1,8 @@
-		ACPI considerations for PCI host bridges
+.. SPDX-License-Identifier: GPL-2.0
+
+========================================
+ACPI considerations for PCI host bridges
+========================================
 
 The general rule is that the ACPI namespace should describe everything the
 OS might use unless there's another way for the OS to find it [1, 2].
@@ -131,12 +135,13 @@ address always corresponds to bus 0, even if the bus range below the bridge
 
 [4] ACPI 6.2, sec 6.4.3.5.1, 2, 3, 4:
     QWord/DWord/Word Address Space Descriptor (.1, .2, .3)
-    General Flags: Bit [0] Ignored
+      General Flags: Bit [0] Ignored
 
     Extended Address Space Descriptor (.4)
-    General Flags: Bit [0] Consumer/Producer:
-	1–This device consumes this resource
-	0–This device produces and consumes this resource
+      General Flags: Bit [0] Consumer/Producer:
+
+        * 1 – This device consumes this resource
+        * 0 – This device produces and consumes this resource
 
 [5] ACPI 6.2, sec 19.6.43:
     ResourceUsage specifies whether the Memory range is consumed by

Documentation/PCI/index.rst

@@ -12,3 +12,4 @@ Linux PCI Bus Subsystem
    picebus-howto
    pci-iov-howto
    msi-howto
+   acpi-info