doc: Sync common content with TF-A

Some information, such as contact details, is shared between
TF-A and the TF-A Tests. Bring this into line with what is in
the TF-A repo.

Change-Id: I910e229a93da67c85d70c633d5a4597a6a788b50
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
Signed-off-by: Jimmy Brisson <jimmy.brisson@arm.com>
diff --git a/docs/about/features.rst b/docs/about/features.rst
index 16055fc..2b810ce 100644
--- a/docs/about/features.rst
+++ b/docs/about/features.rst
@@ -1,15 +1,44 @@
 Feature Overview
 ================
 
-Still to come
-`````````````
+This page provides an overview of the current TF-A Tests feature set. The
+:ref:`Change Log & Release Notes` document provides details of changes made
+since the last release.
 
--  More tests.
--  Support for new platforms.
--  Design improvements.
--  Stability improvements.
--  Enhance test framework to make it easier to implement tests.
--  Fixing known issues (see the `change log`_ for more details).
+Current Features
+----------------
+
+The following TF-A features are currently tested to some extent (this list is
+not exhaustive):
+
+-  `SMC Calling Convention`_
+-  `Power State Coordination Interface (PSCI)`_
+-  `Software Delegated Exception Interface (SDEI)`_
+-  `Performance Measurement Framework (PMF)`_
+-  Communication and interaction with the `Test Secure Payload (TSP)`_
+-  `Firmware update`_ (or recovery mode)
+-  `EL3 payload`_ boot flow
+-  `Secure partition`_ support
+
+These tests are not a compliance test suite for the Arm interface standards used
+in TF-A (such as PSCI).
+
+They do not cover 100% of the TF-A code. The fact that all tests pass does not
+mean that TF-A is free of bugs.
+
+They are not reference code. They should not be considered as the official way
+to test hardware/firmware features. Instead, they are provided as example code
+to experiment with and improve on.
+
+Still to come
+-------------
+
+-  Additional tests
+-  Support for new platforms
+-  Design improvements
+-  Stability improvements
+-  Enhancements to the test framework to make it easier to implement tests
+-  Fixes for known issues (detailed in :ref:`Change Log & Release Notes`)
 
 --------------