Better documentation for executors

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #512 (9c5961b) into master (6c47878) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #512      +/-   ##
==========================================
- Coverage   93.35%   93.30%   -0.06%     
==========================================
  Files          32       32              
  Lines        2226     2224       -2     
==========================================
- Hits         2078     2075       -3     
- Misses        148      149       +1     

Flag	Coverage Δ
Pkg.test	89.47% <ø> (-0.06%)	⬇️
Run.test	93.16% <ø> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
src/core.jl	89.30% <ø> (ø)
src/dreduce.jl	100.00% <ø> (ø)
src/executors.jl	94.23% <ø> (ø)
src/processes.jl	94.21% <ø> (ø)
src/reduce.jl	82.14% <ø> (-0.32%)	⬇️
src/nondeterministic_threading.jl	88.77% <0.00%> (-1.03%)	⬇️

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