Doc: document table persistence display in \dt+.

Forgotten in commit 9a2ea6183.

doc/src/sgml/ref/psql-ref.sgml

@@ -1361,14 +1361,16 @@ testdb=>
         In this group of commands, the letters <literal>E</literal>,
         <literal>i</literal>, <literal>m</literal>, <literal>s</literal>,
         <literal>t</literal>, and <literal>v</literal>
-        stand for foreign table, index, materialized view, sequence, table, and view,
+        stand for foreign table, index, materialized view,
+        sequence, table, and view,
         respectively.
         You can specify any or all of
         these letters, in any order, to obtain a listing of objects
-        of these types.  For example, <literal>\dit</literal> lists indexes
-        and tables.  If <literal>+</literal> is
+        of these types.  For example, <literal>\dti</literal> lists
+        tables and indexes.  If <literal>+</literal> is
         appended to the command name, each object is listed with its
-        physical size on disk and its associated description, if any.
+        persistence status (permanent, temporary, or unlogged),
+        physical size on disk, and associated description if any.
         If <replaceable class="parameter">pattern</replaceable> is
         specified, only objects whose names match the pattern are listed.
         By default, only user-created objects are shown; supply a