doc: adjust 9970443640b4569cf72b3c8e84abe80bdf533c7f for "null string"

Bruce Momjian <bruce@momjian.us>

Commit: 2362c2bd234f01935336208fe2924c986564baa9
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-04-23T00:33:12Z
Releases: 9.4.0
doc:  adjust 9970443640b4569cf72b3c8e84abe80bdf533c7f for "null string"

Report by Andrew Dunstan

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doc/src/sgml/ref/copy.sgml modified +1 −1