Add support for exchanging tokens in Keycloak

Change-Id: Ie5d5bee36ece52aefd035013e8f946b1160e8c58
(cherry picked from commit c0ba66642718e492979b43bad2b2fc1ba9d7a217)
diff --git a/doc/source/index.rst b/doc/source/index.rst
index 9703ada..de86dca 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -28,6 +28,7 @@
    config/index
    deploy/index
    admin/index
+   user/index
    release-notes