Docs: Update documents

Update folder structure in readme to align with build split change.
Specify eRPC test framework in index.rst otherwise it might mislead
users that eRPC test framework is the default one.

Signed-off-by: David Hu <david.hu@arm.com>
Change-Id: I444a4ca97a8b865a9222c4b373c5a758c2822fb0
diff --git a/docs/index.rst b/docs/index.rst
index ca85732..98fb3c2 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -13,7 +13,7 @@
   :titlesonly:
   :hidden:
 
-  Test Framework <tfm_erpc_test_framework>
+  eRPC Test Framework <tfm_erpc_test_framework>
   Test Partitions <tfm_test_partitions_addition>
   Test Suites <tfm_test_suites_addition>
 
diff --git a/readme.rst b/readme.rst
index 39df659..3ce86d5 100644
--- a/readme.rst
+++ b/readme.rst
@@ -12,14 +12,15 @@
 ****************
 Folder Structure
 ****************
-- app - The application code that executes the testing, including both the TF-M
-  tests and the `psa-arch-tests`_.
+- app_broker - Common application code that executes the testing, included by the TF-M tests and
+  the `psa-arch-tests`_.
+- cmake - Common CMake utility scripts.
 - docs - The documents about test developments.
-- CMSIS - The libraries of RTX which is the Non-secure RTOS of the tests
-- test - The TF-M test codes including test framework, test suites and test
-  services
-- lib/ext - 3rd party projects. May contain either imported source codes or CMake files to fetch the
-  projects.
+- erpc - eRPC test framework.
+- lib - TF-M libraries and 3rd-party libraries. May contain either imported source codes or CMake
+  files to fetch the projects.
+- tests_psa_arch - PSA Arch tests integration with TF-M.
+- tests_reg - TF-M regression test codes including test framework, test suites and test services.
 
 #######
 License