docs: Fix conditional in ambient mode check method (18832168).

Fix issue with non existent variable (18832287).
Fix issue with outdated instructions (18832293).
Fix issue with misleading time tick (18832171).

bug: 18832168
bug: 18832171
bug: 18832287
bug: 18832293
Change-Id: I4f071846589ba7edda500342ccd5fac6ecca3161