doc: Remove trailing whitespace in xref

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: 937741cbe506bcd59363008fa6a9038a981665cd
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2025-09-24T19:39:38Z
Releases: 18.1
doc: Remove trailing whitespace in xref

Remove stray whitespace in xref tag.

This was found due to a regression in xmllint 2.15.0 which flagged
this as an error, and at the time of this commit no fix for xmllint
has shipped.

Author: Erik Wienhold <ewie@ewie.name>
Discussion: https://postgr.es/m/f4c4661b-4e60-4c10-9336-768b7b55c084@ewie.name
Backpatch-through: 17

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

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