Rename heap_replace to heap_update.

Bruce Momjian <bruce@momjian.us>

Commit: bb10bf319eb301cdb5d11a5fb1709348754ac6b3
Author: Bruce Momjian <bruce@momjian.us>
Date: 1999-11-24T00:44:37Z
Releases: 7.1.1
Rename heap_replace to heap_update.

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