Move cpk docs to right place in the docstring.

[Michael Scovetta (scovetta)]

The cpk docs were in the wrong place in most of the docstrings.
This change just moves to them to the right spot (the last element).

[Codecov (codecov-io)]

Codecov Report

Merging #642 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #642 +/- ##
=======================================
Coverage 87.01% 87.01% =======================================
Files 52 52 Lines 5285 5285 Branches 566 566 =======================================
Hits 4599 4599 Misses 513 513 Partials 173 173

Impacted Files	Coverage Δ
...torage-blob/azure/storage/blob/blockblobservice.py	92.34% <ø> (ø)	⬆️

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[Codecov Comments Bot (codecov-commenter)]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.01%. Comparing base (54e60c8) to head (1413855).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #642 +/- ##
=======================================
Coverage 87.01% 87.01% =======================================
Files 52 52 Lines 5285 5285 Branches 566 566 =======================================
Hits 4599 4599 Misses 513 513 Partials 173 173 

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