Shorten warning about hash creation

Bruce Momjian <bruce@momjian.us>

Commit: b87671f1b63a0c9cf264afc209e3acebdb52477f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-10-18T14:36:09Z
Releases: 9.5.0
Shorten warning about hash creation

Also document that PITR is also affected.

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