BUG #13967: Documentation. Plpgsql 'execute' description

The following bug has been logged on the website:

Bug reference:      13967
Logged by:          Iurii Popov
Email address:      iurii.i.popov@gmail.com
PostgreSQL version: 9.5.1
Operating system:   Ubuntu
Description:

At
http://www.postgresql.org/docs/9.5/static/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN

you can see

If multiple rows are returned, only the first will be assigned to the INTO
variable.

It will be useful to write information from (or a link to)
http://www.postgresql.org/docs/9.5/static/plpgsql-control-structures.html#AEN62513

about RETURN QUERY EXECUTE statement to return set of rows.