cosmetic: Added docstring to main() function.

BUG=None
TEST=./pre-upload.py --test -v

Change-Id: I051a499d6d67844fcc655a3ce7b6cd90f06e3fe0
Reviewed-on: https://gerrit.chromium.org/gerrit/13714
Tested-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Mandeep Singh Baines <msb@chromium.org>
1 file changed