Docs: Documentation update. Copyright, licensing.

- Add Copyright placement guidance
- Clarify licencing information
- Remove a small typo

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: I4c7cd0dd5607d6e60f6d7f1e87adefcc20006ba0
diff --git a/docs/introduction/readme.rst b/docs/introduction/readme.rst
index db37ead..82559cf 100644
--- a/docs/introduction/readme.rst
+++ b/docs/introduction/readme.rst
@@ -62,7 +62,21 @@
 
 - The ``bl2`` folder contains files imported from MCUBoot project and the files
   have Apache 2.0 license.
-- The ``lib`` folder may contain 3rd party files with diverse licenses.
+- The ``lib/ext`` folder may contain 3rd party projects and files with
+  diverse licenses. Here are some that are different from the BSD-3-Clause and
+  may be a part of the runtime image. The source code for these projects is
+  fetched from upstream at build time only.
+
+   - ``CMSIS_5``    - Apache 2.0 license
+   - ``mbedcrypto`` - `Apache 2.0 license MbedTLS
+     <https://github.com/Mbed-TLS/mbedtls/blob/development/LICENSE>`_
+   - ``mcuboot``    - `Apache 2.0 license MCUBoot
+     <https://github.com/mcu-tools/mcuboot/blob/main/LICENSE>`_
+   - ``qcbor``      - `Modified BSD-3-Clause license
+     <https://github.com/laurencelundblade/QCBOR#copyright-and-license>`_
+   - ``tf-m-extras`` - Set of additional components. Please check individually in
+     `tf-m-extras repository <https://git.trustedfirmware.org/TF-M/tf-m-extras.git/tree/>`_
+
 - The ``platform`` folder currently contains platforms support imported from
   the external project and the files may have different licenses.