DOC: update documentation.

Add documentation covering:
  - developer information about architecture
  - project structure and building
  - project overview and service descriptions
  - the portability model for supporting hardware

Signed-off-by: Julian Hall <julian.hall@arm.com>
Co-Authored-By: Gyorgy Szing <gyorgy.szing@gmail.com>
Change-Id: I8bf9c01a66350719d82a7ca2bc1c78a8ab17978d
diff --git a/docs/project/maintainers.rst b/docs/project/maintainers.rst
index 61d13c5..992d926 100644
--- a/docs/project/maintainers.rst
+++ b/docs/project/maintainers.rst
@@ -1,9 +1,9 @@
 Maintainers
 ===========
 
-|TS| is a Trusted Firmware maintained project. All contributions are ultimately
+|TS| is a trustedfirmware.org maintained project. All contributions are ultimately
 merged by the maintainers listed below. Technical ownership of some parts of the
-codebase is delegated to the code owners listed below. An acknowledgement from
+code-base is delegated to the code owners listed below. An acknowledgment from
 these code maintainers may be required before the maintainers merge a
 contribution.
 
@@ -45,6 +45,6 @@
 .. _`Linux Maintainers file`: https://github.com/torvalds/linux/blob/master/MAINTAINERS#L80
 .. _Project Maintenance Process: https://developer.trustedfirmware.org/w/collaboration/project-maintenance-process/
 
-*Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.*
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
 
 SPDX-License-Identifier: BSD-3-Clause