doc: platform: cznic: turris-omnia-mcu: Fix sphinx-build warning

Fix sphinx-build warnings
  ERROR: Unexpected indentation.
  WARNING: Block quote ends without a blank line; unexpected unindent
in Documentation/ABI/testing/sysfs-bus-i2c-devices-turris-omnia-mcu.

Reported-by: Stephen Rothwell <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
Fixes: dfa556e ("platform: cznic: turris-omnia-mcu: Add support for MCU connected GPIOs")
Tested-by: Stephen Rothwell <[email protected]>
Signed-off-by: Marek Behún <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

Author: elkablo

Documentation/ABI/testing/sysfs-bus-i2c-devices-turris-omnia-mcu

@@ -32,9 +32,9 @@ Description:	(RW) The front button on the Turris Omnia router can be
 		interrupt.
 
 		This file switches between these two modes:
-		- "mcu" makes the button press event be handled by the MCU to
-		  change the LEDs panel intensity.
-		- "cpu" makes the button press event be handled by the CPU.
+		 - "mcu" makes the button press event be handled by the MCU to
+		   change the LEDs panel intensity.
+		 - "cpu" makes the button press event be handled by the CPU.
 
 		Format: %s.