Clarify "raised inside REST framework"

I ran into an issue today where I was not seeing the rest_framework.views.exception_handler do what I thought it should be doing. It turned out that I had imported View from rest_framework.views rather than importing APIView from rest_framework.views. The phrase "raised inside REST framework" was confusing as I was debugging this issue. I was unsure if that meant that I could raise those exceptions in my code or if it had to originate from within framework code.

I'm not sure if the proposed wording is ideal, I just wanted to point out what I found to be confusing.

docs/api-guide/exceptions.md

@@ -84,7 +84,7 @@ Note that the exception handler will only be called for responses generated by r
 
 **Signature:** `APIException()`
 
-The **base class** for all exceptions raised inside REST framework.
+The **base class** for all exceptions raised inside an APIView class or @api_view.
 
 To provide a custom exception, subclass `APIException` and set the `.status_code` and `.default_detail` properties on the class.