doc: PG 16 relnotes, add memory overhead reduction item

Reported-by: David Rowley
Discussion: https://postgr.es/m/CAApHDvqnUoyrJxS4uqnKo87b3_cUjaDDte4NQag49YHu1oEOgA@mail.gmail.com

diff --git a/doc/src/sgml/release-16.sgml b/doc/src/sgml/release-16.sgml
index 77a9feace9eb4bd38d524af8ba8c0acd7db3659e..be97c290d92c3869bac82b51600f41700788e8f9 100644 (file)
--- a/doc/src/sgml/release-16.sgml
+++ b/doc/src/sgml/release-16.sgml
@@ -2798,6 +2798,17 @@ Author: Peter Eisentraut 
 
 Adjust pg_attribute columns for efficiency (Peter Eisentraut)
 
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+Reduce overhead of memory allocations (Andres Freund, David Rowley)
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