doc: add xreflabel for libpq chapter, needed for PG 14 relnotes

Bruce Momjian <bruce@momjian.us>

Commit: 1e7d53bd019e9d86ef1013308715622a2e400d3b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-05-19T15:01:28Z
Releases: 14.0
doc:  add xreflabel for libpq chapter, needed for PG 14 relnotes

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doc/src/sgml/libpq.sgml modified +1 −1

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