Fix git.Commit docs typo

[reuben-sutton]

No description provided.

[codecov-io]

Codecov Report

Merging #577 into master will increase coverage by 1.39%.

@@            Coverage Diff             @@
##           master     #577      +/-   ##
==========================================
+ Coverage   93.12%   94.52%   +1.39%     
==========================================
  Files          63       63              
  Lines        9932     9932              
==========================================
+ Hits         9249     9388     +139     
+ Misses        683      544     -139

Impacted Files	Coverage Δ
git/objects/commit.py	91.59% <ø> (ø)	✅
git/repo/base.py	96.11% <ø> (+0.24%)	✅
git/test/test_docs.py	100% <ø> (+0.39%)	✅
git/cmd.py	85.88% <ø> (+0.47%)	✅
git/objects/submodule/base.py	94.54% <ø> (+1.45%)	✅
git/remote.py	92.97% <ø> (+1.68%)	✅
git/exc.py	96.36% <ø> (+1.81%)	✅
git/test/test_repo.py	97.39% <ø> (+2.25%)	✅
git/test/test_base.py	98.85% <ø> (+2.29%)	✅
git/test/test_index.py	97.36% <ø> (+3.38%)	✅
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 552a0aa...828a5f2. Read the comment docs.

[Byron]

Thanks a lot!