Document order of calling signal handlers (#2155)

[socketpair]

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[codecov-io]

Codecov Report

Merging #2156 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2156   +/-   ##
=======================================
  Coverage   97.09%   97.09%           
=======================================
  Files          39       39           
  Lines        7783     7783           
  Branches     1357     1357           
=======================================
  Hits         7557     7557           
  Misses        101      101           
  Partials      125      125

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