improve hash creation warning message

Bruce Momjian <bruce@momjian.us>

Commit: 849462a9fafbb30856e47f7862543b1aefa95796
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-09-11T17:40:06Z
Releases: 9.5.0
improve hash creation warning message

This improves the wording of commit 84aa8ba128a08e6fdebb2497c7a79ebf18093e12.

Report by Kevin Grittner

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