Обсуждение: pgsql: Add POD documentation to TestLib.pm

Add POD documentation to TestLib.pm

This module was pretty much undocumented.  Fix that.

Inspired by a preliminary patch sent by Ramanarayana, heavily updated by
Andrew Dunstan, and reviewed by Michael Paquier.

Discussion: https://postgr.es/m/CAF6A77G_WJTwBV9SBxCnQfZB09hm1p1O3stZ6eE5QiYd=X84Jg@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/6fcc40b1d4b91471f667fdf3ebe9665fbab95849

Modified Files
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src/test/perl/TestLib.pm | 340 ++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 307 insertions(+), 33 deletions(-)