[django/django] e1fa7d: Fixed #22809 -- Added model Field API reference.

[GitHub]

Branch: refs/heads/master
Home: https://github.com/django/django
Commit: e1fa7dffdc1b141cb858160890d448ca778366e4
https://github.com/django/django/commit/e1fa7dffdc1b141cb858160890d448ca778366e4
Author: Jorge C. Leitão <jorgeca...@gmail.com>
Date: 2014-07-10 (Thu, 10 Jul 2014)

Changed paths:
M docs/howto/custom-model-fields.txt
M docs/ref/models/fields.txt

Log Message:
-----------
Fixed #22809 -- Added model Field API reference.

Thanks to @timgraham for the review.