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
pull/241/head
Daniel Gustafsson 3 months ago
parent 00c3d87a5c
commit a48d1ef586
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