new_variant: update docstrings to match style guide

cros lint is more strict about the style guide for specifying the
arguments to functions, so change Params: to Args: and use the
variable: description format that the style guide specifies.

BUG=None
TEST=`cros lint new_variant.py`
Look for a 10.00/10 rating.

Change-Id: I3fd945a2a9dc6a444b5c895e537d5c84e63f75ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2067067
Tested-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Paul Fagerburg <pfagerburg@chromium.org>
1 file changed