Add 2.x notes and links

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diff --git a/docs/api-guide/fields.md b/docs/api-guide/fields.md
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 source: fields.py
 
+---
+
+**Note**: This is the documentation for the **version 3.0** of REST framework. Documentation for [version 2.4](http://tomchristie.github.io/rest-framework-2-docs/) is also available.
+
+---
+
 # Serializer fields
 
 > Each field in a Form class is responsible not only for validating data, but also for "cleaning" it — normalizing it to a consistent format.