Please help update the "How to beta Test" page

Folks,

Please help update the wiki page around how to beta test.  Particularly,
please update it with particular things we'd like to see users test for,
like data corruption related to freezing (with some notes on how to test
for this).

https://wiki.postgresql.org/wiki/HowToBetaTest

Thanks!

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Josh Berkus
Red Hat OSAS
(any opinions are my own)