Fixed #7986 -- Added to the documentation the purpose of the...

    class ArticleAdmin(admin.ModelAdmin):

        prepopulated_fields = {"slug": ("title",)}

When set the given fields will use a bit of Javascript to populate from the

fields assigned.

``prepopulated_fields`` doesn't accept DateTimeFields, ForeignKeys nor

ManyToManyFields.

When set, the given fields will use a bit of JavaScript to populate from the

fields assigned. The main use for this functionality is to automatically

generate the value for ``SlugField`` fields from one or more other fields. The

generated value is produced by concatenating the values of the source fields,

and then by transforming that result into a valid slug (e.g. substituting

dashes for spaces).

``prepopulated_fields`` doesn't accept ``DateTimeField``, ``ForeignKey``, nor

``ManyToManyField`` fields.

``radio_fields``

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