Fixed #23307 -- Clarified the way max_num limits the output of formsets.

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The ``max_num`` parameter to :func:`~django.forms.formsets.formset_factory`

gives you the ability to limit the maximum number of empty forms the formset

will display::

gives you the ability to limit the number of forms the formset will display::

    >>> from django.forms.formsets import formset_factory

    >>> from myapp.forms import ArticleForm

    <tr><th><label for="id_form-0-title">Title:</label></th><td><input type="text" name="form-0-title" id="id_form-0-title" /></td></tr>

    <tr><th><label for="id_form-0-pub_date">Pub date:</label></th><td><input type="text" name="form-0-pub_date" id="id_form-0-pub_date" /></td></tr>

If the value of ``max_num`` is greater than the number of existing

objects, up to ``extra`` additional blank forms will be added to the formset,

so long as the total number of forms does not exceed ``max_num``.

If the value of ``max_num`` is greater than the number of existing items in the

initial data, up to ``extra`` additional blank forms will be added to the

formset, so long as the total number of forms does not exceed ``max_num``. For

example, if ``extra=2`` and ``max_num=2`` and the formset is initalized with

one ``initial`` item, a form for the initial item and one blank form will be

displayed.

If the number of items in the initial data exceeds ``max_num``, all initial

data forms will be displayed regardless of the value of ``max_num`` and no

extra forms will be displayed. For example, if ``extra=3`` and ``max_num=1``

and the formset is initialized with two initial items, two forms with the

initial data will be displayed.

A ``max_num`` value of ``None`` (the default) puts a high limit on the number

of forms displayed (1000). In practice this is equivalent to no limit.

If the number of forms in the initial data exceeds ``max_num``, all initial

data forms will be displayed regardless.  (No extra forms will be displayed.)

By default, ``max_num`` only affects how many forms are displayed and does not

affect validation.  If ``validate_max=True`` is passed to the

:func:`~django.forms.formsets.formset_factory`, then ``max_num`` will affect