Update documentation regarding response headers.

3.0-HISTORY.rst

@@ -66,5 +66,9 @@
 
 - ``Response.raise_for_status()`` now returns the response object for good responses
 
+- Use ``HTTPHeaderDict`` for response headers, allowing easier access to
+  individual values when multiple response headers are sent using the same
+  header name.
+
 .. _#2002: https://github.com/kennethreitz/requests/issues/2002
 .. _#2631: https://github.com/kennethreitz/requests/issues/2631

docs/user/quickstart.rst

@@ -418,6 +418,10 @@ represented in the dictionary within a single mapping, as per
     of the message, by appending each subsequent field value to the combined
     field value in order, separated by a comma.
 
+If you do need to access each individual value sent with the same header, then
+you can use the ``multiget`` method to get a sequence of all the values returned
+for a particular header.
+
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