Spelling fixes

[scop]

No description provided.

[codecov-io]

Codecov Report

Merging #606 into master will increase coverage by 7.51%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #606      +/-   ##
=========================================
+ Coverage   86.99%   94.5%   +7.51%     
=========================================
  Files          63      63              
  Lines        9959    9961       +2     
=========================================
+ Hits         8664    9414     +750     
+ Misses       1295     547     -748

Impacted Files	Coverage Δ
git/index/base.py	94.5% <ø> (+0.65%)	✅
git/refs/log.py	93.84% <ø> (+0.76%)	✅
git/test/test_docs.py	100% <ø> (+1.19%)	✅
git/util.py	91.66% <ø> (+2.41%)	✅
git/cmd.py	85.54% <ø> (+1.18%)	✅
git/test/lib/helper.py	91.86% <ø> (+1.74%)	✅
git/exc.py	96.36% <ø> (ø)	✅
git/test/test_remote.py	98.36% <ø> (+67.02%)	✅
git/index/typ.py	96.82% <ø> (ø)	✅
git/objects/base.py	95.83% <ø> (ø)	✅
... and 39 more

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[Byron]

Thanks a lot!
I should get to the other PR during the weekend.