providers/radius: property mapping docs (#10908)

* migrate protocols to table

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add radius property mapping example

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* Apply suggestions from code review

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Jens L. <jens@beryju.org>

* add to release notes

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>
Signed-off-by: Jens L. <jens@beryju.org>
Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>

website/docs/releases/2023/v2023.4.md

@@ -23,7 +23,7 @@ slug: "/releases/2023.4"
 
     The RADIUS provider also uses a flow to authenticate users, and supports the same stages as the [LDAP Provider](../../../docs/providers/ldap/index.md).
 
-    Documentation: [RADIUS Provider](../../../docs/providers/radius/index.md)
+    Documentation: [RADIUS Provider](../../../docs/providers/radius/index.mdx)
 
 -   Decreased CPU usage for workers
 

website/docs/releases/2024/v2024.8.md

@@ -66,6 +66,10 @@ To try out the release candidate, replace your Docker image tag with the latest
 
 -   **Source property mappings for SCIM, OAuth, SAML and Plex sources**
 
+-   **RADIUS provider custom attribute support**
+
+    With 2024.8 it is possible to define custom attributes for the RADIUS provider, for example vendor specific attributes like Cisco's `AV-Pair` attribute. These attributes are defined in property mappings which means they can be dynamically defined based on the user authenticating. See [RADIUS Provider](../../providers/radius/index.mdx#radius-attributes)
+
 -   **SAML Source encryption support**
 
     It is now possible to configure a SAML Source to decrypt and validate encrypted assertions. This can be configured by certaing a [Certificate-keypair](../../core/certificates.md) and selecting it in the SAML Source.