Update test_docs.py

[markrowsoft]

Using "import as" is normally a time saver but for usability of the documentation, please consider removing osp and join with fully qualified calls for better snippet readability.

I had some co-workers end up using popen commands vs using this library when I recommended GitPython as they did not understand how it worked from skimming the docs.

Sorry for not writing a test that fails... only a syntax change for readability.

[codecov-io]

Codecov Report

Merging #773 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@ Coverage Diff @@## master #773 +/- ##
==========================================
- Coverage 94.69% 94.69% -0.01% 
==========================================
Files 59 59 Lines 9353 9352 -1 ==========================================
- Hits 8857 8856 -1 
Misses 496 496

Impacted Files	Coverage Δ
git/test/test_docs.py	100% <100%> (ø)	⬆️

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[Byron]

Thanks a lot for your contribution! Along with that other PR which fixes the indentation, the tutorial should be so much easier to read and understand.