docs: don't use nested tables

Nested tables aren't supported for pdf output on Sphinx 1.7.9:

	admin-guide/laptops/sonypi:: nested tables are not yet implemented.
	admin-guide/laptops/toshiba_haps:: nested tables are not yet implemented.
	driver-api/nvdimm/btt:: nested tables are not yet implemented.
	s390/debugging390:: nested tables are not yet implemented.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> # laptops

Documentation/admin-guide/laptops/sonypi.rst

@@ -89,9 +89,8 @@ statically linked into the kernel). Those options are:
 			set to 0xffffffff, meaning that all possible events
 			will be tried. You can use the following bits to
 			construct your own event mask (from
-			drivers/char/sonypi.h):
+			drivers/char/sonypi.h)::
 
-				========================	======
 				SONYPI_JOGGER_MASK		0x0001
 				SONYPI_CAPTURE_MASK		0x0002
 				SONYPI_FNKEY_MASK		0x0004
@@ -106,7 +105,6 @@ statically linked into the kernel). Those options are:
 				SONYPI_MEMORYSTICK_MASK		0x0800
 				SONYPI_BATTERY_MASK		0x1000
 				SONYPI_WIRELESS_MASK		0x2000
-				========================	======
 
 	useinput:	if set (which is the default) two input devices are
 			created, one which interprets the jogdial events as

Documentation/admin-guide/laptops/toshiba_haps.rst

@@ -75,7 +75,7 @@ The sysfs files under /sys/devices/LNXSYSTM:00/LNXSYBUS:00/TOS620A:00/ are:
 protection_level   The protection_level is readable and writeable, and
 		   provides a way to let userspace query the current protection
 		   level, as well as set the desired protection level, the
-		   available protection levels are:
+		   available protection levels are::
 
 		     ============   =======   ==========   ========
 		     0 - Disabled   1 - Low   2 - Medium   3 - High

Documentation/driver-api/nvdimm/btt.rst

@@ -83,7 +83,7 @@ flags, and the remaining form the internal block number.
 ======== =============================================================
 Bit      Description
 ======== =============================================================
-31 - 30	 Error and Zero flags - Used in the following way:
+31 - 30	 Error and Zero flags - Used in the following way::
 
 	   == ==  ====================================================
 	   31 30  Description

Documentation/s390/debugging390.rst

@@ -170,7 +170,7 @@ currently running at.
 |        +----------------+-------------------------------------------------+
 |        |    32          | Basic Addressing Mode                           |
 |        |                |                                                 |
-|        |                | Used to set addressing mode                     |
+|        |                | Used to set addressing mode::                   |
 |        |                |                                                 |
 |        |                |    +---------+----------+----------+            |
 |        |                |    | PSW 31  | PSW 32   |          |            |