Adds a dedicated page (matching the lsm6dso32 one, the closest
register-compatible driver already documented) instead of a plain list
entry: chip description, registration examples for both polling and
interrupt-driven mode -- including the single-shared-INT-pin
config_s/attach() shape this driver actually uses, unlike sensors that
need one interrupt pin per sub-sensor -- and the two custom ioctls
(SNIOC_WHO_AM_I, SNIOC_SETFULLSCALE) with their argument units.
Requested in review on this PR.
Signed-off-by: Felipe Moura <moura.fmo@gmail.com>