Docstring for cu

[mcabbott]

At present the function cu has no docstring, this adds one.

Inspired by https://discourse.julialang.org/t/converting-default-float-type-to-float32/80326 , although in fact it wouldn't help to find this if you don't know it exists.

[codecov]

Codecov Report

Merging #1493 (b1192e5) into master (79d8468) will decrease coverage by 0.71%.
The diff coverage is 100.00%.

❗ Current head b1192e5 differs from pull request most recent head 24f2e46. Consider uploading reports for the commit 24f2e46 to get more accurate results

@@            Coverage Diff             @@
##           master    #1493      +/-   ##
==========================================
- Coverage   77.33%   76.62%   -0.72%     
==========================================
  Files         120      120              
  Lines        9273     9273              
==========================================
- Hits         7171     7105      -66     
- Misses       2102     2168      +66     

Impacted Files	Coverage Δ
lib/utils/call.jl	84.84% <ø> (ø)
src/array.jl	86.42% <ø> (ø)
lib/cudadrv/version.jl	100.00% <100.00%> (ø)
lib/cudnn/CUDNN.jl	37.50% <0.00%> (-35.94%)	⬇️
lib/cublas/CUBLAS.jl	50.00% <0.00%> (-25.44%)	⬇️
src/utilities.jl	68.91% <0.00%> (-4.06%)	⬇️
lib/cudadrv/CUDAdrv.jl	51.66% <0.00%> (-3.34%)	⬇️
lib/cudadrv/module/linker.jl	68.75% <0.00%> (-3.13%)	⬇️
lib/cudadrv/state.jl	77.84% <0.00%> (-2.28%)	⬇️
lib/cudadrv/memory.jl	78.59% <0.00%> (-1.01%)	⬇️

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[maleadt]

Thanks!