doc/application: Use tabs for Setting Variables

Setting variables for console is platform dependent.  Having
uninterested platform mixed in is too noisy and hard to read.  Follow
"Getting Started Guide" pattern to use tabs to group things.

Getting Started Guide uses "Ubuntu" to reference Linux based platform
but Application Development uses "Linux".  This commit doesn't change
the choice of words and sticks to "Linux".

The order of the platfroms is, OTOH, unified to "Linux/macOS" from
"macOS/Linux".

This commit only changes formatting, no wording change.

Signed-off-by: Yasushi SHOJI <yashi@spacecubics.com>
1 file changed