render_to_string and render_to_response use select_template

[p.patruno@…]

In documentaztion:
"The Django template language: For Python programmers"
​http://docs.djangoproject.com/en/dev/ref/templates/api/

accordind with:
​http://code.djangoproject.com/ticket/546

render_to_string and render_to_response can use select_template

so:
"The render_to_string shortcut takes one required argument -- template_name, which should be the name of the template to load and render -- and two optional arguments:"

should be:
"The render_to_string shortcut takes one required argument -- template_name, which should be a string with the name of the template to load and render or a list or tuple containing templates arguments for select_template -- and two optional arguments:"

[Adrian Holovaty]

(In [12161]) Fixed #10800 -- Made a small improvement to render_to_string() docs. Thanks, p.patruno@… and timo