Extend non-isbits argument error text.

[maleadt]

Closes JuliaGPU/CUDA.jl#2514

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.40%. Comparing base (d370e19) to head (89bdacf).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #638      +/-   ##
==========================================
- Coverage   72.39%   71.40%   -1.00%     
==========================================
  Files          24       24              
  Lines        3224     3224              
==========================================
- Hits         2334     2302      -32     
- Misses        890      922      +32     

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