docs: ABI: convert testing/configfs-acpi to ReST

There are some problems with this file when a ReST content
is produced. Fix it.

Acked-by: Jonathan Corbet <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Link: https://lore.kernel.org/r/f56daf[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/ABI/testing/configfs-acpi

···
 		This group contains the configuration for user defined ACPI
 		tables. The attributes of a user define table are:
 
-		aml 		- a binary attribute that the user can use to
+		aml
+			      - a binary attribute that the user can use to
 				fill in the ACPI aml definitions. Once the aml
 				data is written to this file and the file is
 				closed the table will be loaded and ACPI devices
···
 		The rest of the attributes are read-only and are valid only
 		after the table has been loaded by filling the aml entry:
 
-		signature 	- ASCII table signature
-		length 		- length of table in bytes, including the header
-		revision 	- ACPI Specification minor version number
-		oem_id 		- ASCII OEM identification
-		oem_table_id 	- ASCII OEM table identification
-		oem_revision 	- OEM revision number
-		asl_compiler_id - ASCII ASL compiler vendor ID
-		asl_compiler_revision - ASL compiler version
+		signature
+				- ASCII table signature
+
+		length
+				- length of table in bytes, including the header
+
+		revision
+				- ACPI Specification minor version number
+
+		oem_id
+				- ASCII OEM identification
+
+		oem_table_id
+				- ASCII OEM table identification
+
+		oem_revision
+				- OEM revision number
+
+		asl_compiler_id
+				- ASCII ASL compiler vendor ID
+
+		asl_compiler_revision
+				- ASL compiler version