Copy edits in the documentation [ci skip]

actionpack/CHANGELOG.md

 *   Add `:as` option to `ActionController:TestCase#process` and related methods.
-    
-    Specifying as: :mime_type allows the `CONTENT_TYPE` header to be specified
-    in controller tests without manually doing this through `@request.headers...`   
+
+    Specifying `as: mime_type` allows the `CONTENT_TYPE` header to be specified
+    in controller tests without manually doing this through `@request.headers['CONTENT_TYPE']`.
+
+    *Everest Stefan Munro-Zeisberger*
 
 *   Show cache hits and misses when rendering partials.
 

actionpack/lib/action_controller/test_case.rb

@@ -450,7 +450,7 @@ def xml_http_request(*args)
       # - +flash+: A hash of parameters to store in the flash. This may be +nil+.
       # - +format+: Request format. Defaults to +nil+. Can be string or symbol.
       # - +as+: Content type. Defaults to +nil+. Must be a symbol that corresponds
-      #   to a mime type
+      #   to a mime type.
       #
       # Example calling +create+ action and sending two params:
       #