Fixed #13687 -- Corrected request/response docs that mistakenly suggested __getitem__ and __delitem__ were case sensitive. Thanks to master for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13529 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/request-response.txt

@@ -498,11 +498,11 @@ Methods
 .. method:: HttpResponse.__delitem__(header)
 
     Deletes the header with the given name. Fails silently if the header
-    doesn't exist. Case-sensitive.
+    doesn't exist. Case-insensitive.
 
 .. method:: HttpResponse.__getitem__(header)
 
-    Returns the value for the given header name. Case-sensitive.
+    Returns the value for the given header name. Case-insensitive.
 
 .. method:: HttpResponse.has_header(header)