Attach CUSPARSE docstrings to bare methods, not empty functions.

[maleadt]

Fixes #322, #256

[codecov]

Codecov Report

Merging #331 into master will increase coverage by 0.14%.
The diff coverage is 91.17%.

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
+ Coverage   79.29%   79.43%   +0.14%     
==========================================
  Files         155      156       +1     
  Lines        8902     8915      +13     
==========================================
+ Hits         7059     7082      +23     
+ Misses       1843     1833      -10     

Impacted Files	Coverage Δ
lib/curand/random.jl	93.44% <ø> (+4.43%)	⬆️
lib/cusolver/wrappers.jl	90.28% <ø> (ø)
lib/cusparse/wrappers.jl	82.70% <ø> (+2.20%)	⬆️
src/CUDA.jl	100.00% <ø> (ø)
src/gpuarrays.jl	41.66% <ø> (-6.34%)	⬇️
src/random.jl	80.64% <80.64%> (ø)
lib/curand/CURAND.jl	100.00% <100.00%> (ø)
test/random.jl	100.00% <100.00%> (ø)
... and 2 more

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