Update markdowns

Author: heyams

docs/attributes-registry/README.md

@@ -34,6 +34,7 @@ Currently, the following namespaces exist:
 - [Android](android.md)
 - [Artifact](artifact.md)
 - [Aspnetcore](aspnetcore.md)
+- [Authentication](authentication.md)
 - [AWS](aws.md)
 - [Azure](azure.md)
 - [Browser](browser.md)

docs/attributes-registry/authentication.md

@@ -0,0 +1,17 @@
+<!--- Hugo front matter used to generate the website version of this page:
+--->
+
+<!-- NOTE: THIS FILE IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/attribute_namespace.md.j2 -->
+
+# Authentication
+
+## Authentication Attributes
+
+"Describes the authentication information of an authenticated user."
+
+| Attribute              | Type   | Description                                                                                                                                                                                                                                                                                                                                                                             | Examples                                           | Stability                                                        |
+| ---------------------- | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------- | ---------------------------------------------------------------- |
+| `authentication.id`    | string | Unique identifier of an authenticated user in the system.                                                                                                                                                                                                                                                                                                                               | `S-1-5-21-202424912787-2692429404-2351956786-1000` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+| `authentication.role`  | string | Actual/assumed role the client is making the request under extracted from token or application security context.                                                                                                                                                                                                                                                                        | `admin`                                            | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+| `authentication.scope` | string | Scopes or granted authorities the client currently possesses extracted from token or application security context. The value would come from the scope associated with an [OAuth 2.0 Access Token](https://tools.ietf.org/html/rfc6749#section-3.3) or an attribute value in a [SAML 2.0 Assertion](http://docs.oasis-open.org/security/saml/Post2.0/sstc-saml-tech-overview-2.0.html). | `read:message, write:files`                        | ![Experimental](https://img.shields.io/badge/-experimental-blue) |

docs/attributes-registry/enduser.md

@@ -6,12 +6,11 @@
 
 # Enduser
 
-## Deprecated End User Attributes
+## End User Attributes
 
-Describes deprecated enduser attributes. Complete enduser namespace has been deprecated
+Describes information about the end user, which can be used as a subdomain of browser, client, or user domains.
 
-| Attribute       | Type   | Description                              | Examples                    | Stability                                                                                          |
-| --------------- | ------ | ---------------------------------------- | --------------------------- | -------------------------------------------------------------------------------------------------- |
-| `enduser.id`    | string | Deprecated, use `user.id` instead.       | `username`                  | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `user.id` attribute.    |
-| `enduser.role`  | string | Deprecated, use `user.roles` instead.    | `admin`                     | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `user.roles` attribute. |
-| `enduser.scope` | string | Deprecated, no replacement at this time. | `read:message, write:files` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Removed.                            |
+| Attribute           | Type   | Description                                                                                                                                                                          | Examples                                           | Stability                                                        |
+| ------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------- | ---------------------------------------------------------------- |
+| `authentication.id` | string | Unique identifier of an authenticated user in the system.                                                                                                                            | `S-1-5-21-202424912787-2692429404-2351956786-1000` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+| `enduser.id`        | string | Identifier of an end user who interacts with a system. This identifier may be unique only through best-effort means and does not imply that the user is authenticated to the system. | `QdH5CAWJgqVT4rOr0qtumf`                           | ![Experimental](https://img.shields.io/badge/-experimental-blue) |