doc: Document that only superusers can use pg_import_system_collations().

MasaoFujii · MasaoFujii · commit df3264e73f6f · 2021-07-21T13:53:24.000+09:00
Back-patch to v10 where pg_import_system_collations() was added. Author: Atsushi Torikoshi Reviewed-by: Fujii Masao Discussion: https://postgr.es/m/b7f484692a3e283710032e68b7f40617@oss.nttdata.com
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
@@ -25589,6 +25589,7 @@ postgres=# SELECT * FROM pg_walfile_name_offset(pg_stop_backup());
         be <literal>pg_catalog</literal>, but that is not a requirement; the
         collations could be installed into some other schema as well.  The
         function returns the number of new collation objects it created.
+        Use of this function is restricted to superusers.
        </para></entry>
       </row>
      </tbody>
