doc: Improve layout of Zephyr-specific DTS properties table
doc: Improve layout of Zephyr-specific DTS properties table

The layout of this table unreasonably assigns narrow widths for
for column(s) with lots of content, and wise-versa.

Define relative column widths to be more in sync with column
content. This will potentially produce more compact table, making
it more readable, clearer and more visually pleasing.

Signed-off-by: Aleksandar Markovic <8084fc9c6866c5a3f7ad74f44ee247322c1b4f7a@gmail.com>

finikorg/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr