Updated OAuth docs per arothfusz's comments

Added emphasis of https for OAuth interactions.
Updated example URIs to use HTTPS
Included redirect hostname on authorization page.

Docker-DCO-1.1-Signed-off-by: Josh hawn <josh.hawn@docker.com> (github: jlhawn)

docs/sources/reference/api/docker_io_oauth_api.rst

@@ -21,6 +21,8 @@ access you must first register your application.
 Before continuing, we encourage you to familiarize yourself with
 `The OAuth 2.0 Authorization Framework <http://tools.ietf.org/html/rfc6749>`_.
 
+*Also note that all OAuth interactions must take place over https connections*
+
 
 2. Register Your Application
 ============================
@@ -34,9 +36,10 @@ following information:
 - The name of your application
 - A description of your application and the service it will provide
   to docker.io users.
-- A list of one or more redirect URIs that we will use for redirecting
-  authorization requests to your application. These are used in the step
-  of getting an Authorization Code.
+- A callback URI that we will use for redirecting authorization requests to
+  your application. These are used in the step of getting an Authorization
+  Code. The domain name of the callback URI will be visible to the user when
+  they are requested to authorize your application.
 
 When your application is approved you will receive a response from the
 docker.io team with your ``client_id`` and ``client_secret`` which your
@@ -85,7 +88,7 @@ link in your application to an OAuth Authorization endpoint.
 
     .. sourcecode:: http
 
-        GET /api/v1.1/o/authorize/?client_id=TestClientID&response_type=code&redirect_uri=http%3A//my.app/auth_complete/&scope=profile_read%20email_read&state=abc123 HTTP/1.1
+        GET /api/v1.1/o/authorize/?client_id=TestClientID&response_type=code&redirect_uri=https%3A//my.app/auth_complete/&scope=profile_read%20email_read&state=abc123 HTTP/1.1
         Host: www.docker.io
 
     **Authorization Page**
@@ -95,7 +98,7 @@ link in your application to an OAuth Authorization endpoint.
     be presented with the following authorization prompt which asks the user
     to authorize your application with a description of the requested scopes.
 
-    .. image:: _static/io_oauth_authorization_page.jpg
+    .. image:: _static/io_oauth_authorization_page.png
 
     Once the user allows or denies your Authorization Request the user will be
     redirected back to your application. Included in that request will be the
@@ -152,7 +155,7 @@ that you must then use to get an Access Token.
         {
             "grant_type": "code",
             "code": "YXV0aG9yaXphdGlvbl9jb2Rl",
-            "redirect_uri": "http://my.app/auth_complete/"
+            "redirect_uri": "https://my.app/auth_complete/"
         }
 
     **Example Response**
@@ -199,6 +202,23 @@ revoked access from your application.
         Must not include any scope not originally granted by the user and if
         omitted is treated as equal to the scope originally granted.
 
+    **Example Request**
+
+    Refreshing an access token.
+
+    .. sourcecode:: http
+
+        POST /api/v1.1/o/token/ HTTP/1.1
+        Host: www.docker.io
+        Authorization: Basic VGVzdENsaWVudElEOlRlc3RDbGllbnRTZWNyZXQ=
+        Accept: application/json
+        Content-Type: application/json
+
+        {
+            "grant_type": "refresh_token",
+            "refresh_token": "hJDhLH3cfsUrQlT4MxA6s8xAFEqdgc",
+        }
+
     **Example Response**
 
     .. sourcecode:: http