DOC improve module reconstructor docs

[pierreglaser]

Side effect of me working on #405

cc @ogrisel

[codecov]

Codecov Report

Merging #407 (ca322bd) into master (cdc704d) will decrease coverage by 8.68%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #407      +/-   ##
==========================================
- Coverage   91.61%   82.92%   -8.69%     
==========================================
  Files           3        3              
  Lines         656      656              
  Branches      135      135              
==========================================
- Hits          601      544      -57     
- Misses         34       88      +54     
- Partials       21       24       +3     

Impacted Files	Coverage Δ
cloudpickle/cloudpickle.py	86.09% <ø> (-0.60%)	⬇️
cloudpickle/compat.py	70.00% <0.00%> (-30.00%)	⬇️
cloudpickle/cloudpickle_fast.py	79.87% <0.00%> (-16.89%)	⬇️

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[ogrisel]

Thanks for the doc improvement @pierreglaser!