Corstone1000: update documentation

Add a new page under platforms with some generic Cortsone1000 related
information.
Make some minor corrections.

Change-Id: Ie26eda0607dcfde71062493f40ba8e8bdca611e4
Signed-off-by: Gyorgy Szing <gyorgy.szing@arm.com>
diff --git a/docs/developer/service-deployment-model.rst b/docs/developer/service-deployment-model.rst
index 8200adf..4e3879f 100644
--- a/docs/developer/service-deployment-model.rst
+++ b/docs/developer/service-deployment-model.rst
@@ -196,7 +196,7 @@
   platform
       |-- providers
               |--arm
-                  |-- corstone1000
+                  |-- Corstone1000
                   |-- fvp
                       |-- fvp_base_aemva
                       |-- fvp_base_revc-2xaemv8a
diff --git a/docs/target-platforms/Corstone1000.rst b/docs/target-platforms/Corstone1000.rst
new file mode 100644
index 0000000..8a89b7c
--- /dev/null
+++ b/docs/target-platforms/Corstone1000.rst
@@ -0,0 +1,20 @@
+Corstone-1000
+=============
+
+Corstone-1000 is an Arm reference platform which is built upon a pre-verified Corstone SSE-710 subsystem that provides a
+flexible compute architecture which combines Cortex®‑A and Cortex®‑M processors.
+
+For more information please see the following resources:
+
+    - `Corstone-1000 product homepage`_.
+    - Documentation of the `Corstone-1000 software stack`_.
+
+--------------
+
+.. _`Corstone-1000 product homepage`: https://developer.arm.com/Processors/Corstone-1000
+.. _`Corstone-1000 software stack`: https://corstone1000.docs.arm.com/en/latest/
+
+*Copyright (c) 2024, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
+
diff --git a/docs/target-platforms/index.rst b/docs/target-platforms/index.rst
index 49bffb1..a271889 100644
--- a/docs/target-platforms/index.rst
+++ b/docs/target-platforms/index.rst
@@ -16,13 +16,12 @@
    - Obsolete
      Platforms which are not tested for the current release are put into this category.
 
-   - Deprecated Platforms not tested for more than one two are threated as obsolete, and will be
-     removed for the next release.
+   - Deprecated Platforms not tested for more than one two releases are threated as obsolete, and
+     will be removed for the next release.
 
 The quality of the platform, known issues, feature limitations, extra features, etc... are defined
 in the sub-chapters below.
 
-
 Reference platforms
 -------------------
 
@@ -31,6 +30,16 @@
 
     ./aem-fvp
 
+Active Platforms
+----------------
+
+These platforms are not maintained by the Trusted Services project and are contributed externally. Instructions about
+building and running the software stacks of these platforms is out of scope for TS documentation.
+
+.. toctree::
+    :maxdepth: 1
+
+    ./Corstone1000
 
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