Revert "doc: Remove trailing whitespace in xref"

This reverts commit 987e00fa990fc905fe8fab645a16f7a4be3d9126 due
to me missing the release freeze.

diff --git a/doc/src/sgml/ref/pg_combinebackup.sgml b/doc/src/sgml/ref/pg_combinebackup.sgml
index 9a6d201e0b8e32bfd1c408fcfda5f017ee9b9a18..330a598f7013e9e79141544622423fc44c317349 100644 (file)
--- a/doc/src/sgml/ref/pg_combinebackup.sgml
+++ b/doc/src/sgml/ref/pg_combinebackup.sgml
@@ -314,7 +314,7 @@ PostgreSQL documentation
 
   <para>
    To avoid this problem, taking a new full backup after changing the checksum
-   state of the cluster using <xref linkend="app-pgchecksums"/> is
+   state of the cluster using <xref linkend="app-pgchecksums "/> is
    recommended. Otherwise, you can disable and then optionally reenable
    checksums on the directory produced by <literal>pg_combinebackup</literal>
    in order to correct the problem.