docs: mention windows quoting change in 9.4 release notes

Bruce Momjian <bruce@momjian.us>

Commit: eb6144bb447ecbb036bfa08da85940cd50d49410
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-05-14T15:02:03Z
Releases: 9.4.0
docs:  mention windows quoting change in 9.4 release notes

Report by Heikki Linnakangas

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doc/src/sgml/release-9.4.sgml modified +15 −0