feat: rename model prediction variable in examples

[alexander-held]

Instead of storing the output of model_utils.prediction in variables named model_*, this PR switches to prediction_*. The use of model in the name could be misleading as the statistical model (pyhf.pdf.Model) is also called "model", and the model prediction is a different object.

* use "prediction" instead of "model" for model_utils.prediction return value names in examples

[codecov[bot]]

Codecov Report

Merging #358 (a1dd25b) into master (d491aab) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #358   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           23        23           
  Lines         2001      2001           
  Branches       326       326           
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  Hits          2001      2001           

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