Updated WHEEL_TICK configArray documentation in VHAL.

It now specifies that the micrometers-per-wheel-tick values are static
and approximations.

Test: None
Bug: 169364681
Change-Id: Ia002bdcf7c9a91d82d8f6d543d2476d227256046
Merged-In: Ia002bdcf7c9a91d82d8f6d543d2476d227256046
(cherry picked from commit c0653a4452e34065c25442189784f205db3519b3)
2 files changed