doc: PG 13 rels: use xref labels referencing ref/*.sgml files

Bruce Momjian <bruce@momjian.us>

Commit: 6755b618997424b9e651126f59bf4109d680fffe
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-15T16:47:07Z
Releases: 13.0
doc:  PG 13 rels:  use xref labels referencing ref/*.sgml files

This avoids using <link> and supplied text.

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PathChange+/−
doc/src/sgml/release-13.sgml modified +72 −85

Documentation touched