lint: clean up lib/git.py docstring lint errors.
lint: clean up lib/git.py docstring lint errors.

BUG=None
TEST=pylint

Change-Id: I6c29b85adf1c6128f73beb9b741414c02af48704
Reviewed-on: https://chromium-review.googlesource.com/180980
Tested-by: Matt Tennant <46e612415b446ccde19638e4035892001c237942@chromium.org>
Reviewed-by: Aviv Keshet <178e8ae417efbe404feca7ab4cb8f0ba8c109369@chromium.org>
Commit-Queue: Matt Tennant <46e612415b446ccde19638e4035892001c237942@chromium.org>

bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite