doc: Fix explanation related to pg_shmem_allocations

michaelpq · michaelpq · commit bce641a2af71 · 2020-12-16T10:36:03.000+09:00
Offsets are shown as NULL only for anonymous allocations. Author: Benoit Lobréau Reviewed-by: Kyotaro Horiguchi Discussion: https://postgr.es/m/CAPE8EZ5Lnoyqoz7aZpvQM0E8sW+hw+k6G2NULe+m4arFRrA1aA@mail.gmail.com Backpatch-through: 13
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
@@ -12493,7 +12493,7 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
       </para>
       <para>
        The offset at which the allocation starts. NULL for anonymous
-       allocations and unused memory.
+       allocations, since details related to them are not known.
       </para></entry>
      </row>
 
