[Django] #30689: Fix documentation for the `fields` argument of MultiValueField

[Django]

#30689: Fix documentation for the `fields` argument of MultiValueField
-----------------------------------------+------------------------
               Reporter:  Adam Sołtysik  |          Owner:  nobody
                   Type:  Uncategorized  |         Status:  new
              Component:  Documentation  |        Version:  2.2
               Severity:  Normal         |       Keywords:
           Triage Stage:  Unreviewed     |      Has patch:  0
    Needs documentation:  0              |    Needs tests:  0
Patch needs improvement:  0              |  Easy pickings:  0
                  UI/UX:  0              |
-----------------------------------------+------------------------
 In the
 [https://docs.djangoproject.com/en/2.2/ref/forms/fields/#multivaluefield
 documentation] there is the class header:

 {{{class MultiValueField(fields=(), **kwargs)}}}

 However, in the
 
[https://docs.djangoproject.com/en/2.2/_modules/django/forms/fields/#MultiValueField
 source code] the `fields` argument has no default value:

 {{{def __init__(self, fields, *, require_all_fields=True, **kwargs):}}}

 This behaviour seems to have changed in Django 2.0 (some of my forms
 started crashing after the upgrade), but there is nothing about it in the
 [https://docs.djangoproject.com/en/2.2/releases/2.0/ release notes].

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30689>
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