Corrected usage / example code of parameter 'choices'

[haesleinhuepf]

Hi Talley @tlambert03 ,

when I derived code from this example, I stumbled over that "arg" variable name here. I think it's better explained like this.

Cheers,
Robert

[codecov]

Codecov Report

Merging #57 (d234a85) into master (008b0c7) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   77.57%   77.52%   -0.06%     
==========================================
  Files          16       16              
  Lines        1793     1793              
==========================================
- Hits         1391     1390       -1     
- Misses        402      403       +1     

Impacted Files	Coverage Δ
magicgui/type_map.py	90.97% <0.00%> (-0.76%)	⬇️

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[tlambert03]

indeed it is! thanks! I'm in the process of rewriting the docs at this very moment... and will make sure this gets incorporated there as well