doc: PG 13 relnotes: move docbook version change to doc sect.

diff --git a/doc/src/sgml/release-13.sgml b/doc/src/sgml/release-13.sgml
index 0697dec59ea0c8f63d0c3b7b82971b7be2d84753..238a1bf392aa79e8870e47d74105148629d19c85 100644 (file)
--- a/doc/src/sgml/release-13.sgml
+++ b/doc/src/sgml/release-13.sgml
@@ -2361,15 +2361,6 @@ Reformat tables containing function information for better clarity (Tom Lane)
 
 
 
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