Add id_for_label in Django forms topic documentation

[ebertti@…]

Please, add this feature to the documentations.

​https://docs.djangoproject.com/en/dev/topics/forms/#looping-over-the-form-s-fields

{{ field.id_for_label }}
The id of the field that will be used in the input element’s field.

I need to see a lot of files to find something to get this value of a form field.

[Tim Graham]

It's already in the ​forms API docs, but yes, we could add it the topic doc as you've suggested.

[Daniele Procida]

I've marked this ticket as especially suitable for first-time committers or people following the ​Don't be afraid to commit tutorial. If you're tackling this ticket, please don't hesitate to ask me for guidance if you'd like any, either here or on the Django IRC channels, where I can be found as EvilDMP.

[saoili]

Pull Request ​https://github.com/django/django/pull/1742 sent

[Tim Graham <timograham@…>]

In 6e7de2edb0565e0ea2fd4ff6701e97ead67138b9:

[1.5.x] Fixed #21223 -- Added form.id_for_label to topic guide.

Thanks ebertti at yahoo.com.br for the suggestion.

Backport of 018e2c055a from master

[Tim Graham <timograham@…>]

In 07ebd23254acab0677aca8baf76440811e9473e2:

[1.6.x] Fixed #21223 -- Added form.id_for_label to topic guide.

Thanks ebertti at yahoo.com.br for the suggestion.

Backport of 018e2c055a from master