doc PG 18 relnotes: add pg_log_backend_memory_contexts() mention

Now zero-based.

Reported-by: David Rowley

Discussion: https://postgr.es/m/CAApHDvqMfTBdfwc0Z-tHXLnBMKJLYEZDApgUzA7x_PUDZsY3GA@mail.gmail.com

doc/src/sgml/release-18.sgml

@@ -173,16 +173,19 @@ This is now longer needed since pg_backend_memory_contexts.path was added.
 <!--
 Author: David Rowley <drowley@postgresql.org>
 2024-07-25 [32d3ed816] Add path column to pg_backend_memory_contexts view
+Author: David Rowley <drowley@postgresql.org>
+2025-04-18 [d9e03864b] Make levels 1-based in pg_log_backend_memory_contexts()
 -->
 
 <listitem>
 <para>
-Change pg_backend_memory_contexts.level to be one-based (Melih Mutlu)
+Change pg_backend_memory_contexts.level and pg_log_backend_memory_contexts()() to be one-based (Melih Mutlu, Fujii Masao)
 <ulink url="&commit_baseurl;32d3ed816">&sect;</ulink>
+<ulink url="&commit_baseurl;d9e03864b">&sect;</ulink>
 </para>
 
 <para>
-It was previously zero-based.
+These were previously zero-based.
 </para>
 </listitem>