Improve C comments about backend variables set by pg_upgrade_support

Bruce Momjian <bruce@momjian.us>

Commit: 46d28820b6d213bf26b24ecd289a1c466ecf1956
Author: Bruce Momjian <bruce@momjian.us>
Date: 2011-01-07T03:45:36Z
Releases: 9.1.0
Improve C comments about backend variables set by pg_upgrade_support
functions.

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