docs: improve xref description for xreflabel and refentry links

Bruce Momjian <bruce@momjian.us>

Commit: c29a6dd54860082153ec7fedb603a4c2c37b1445
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-01-30T17:26:18Z
Releases: 9.4.0
docs:  improve xref description for xreflabel and refentry links

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doc/src/sgml/README.links modified +3 −2