doc: Update page content after re-arrangement

This patch modifies the content of existing documents now that
it has been moved around. Some of the content requires updating
to make sense in its new location, for example. Other content may
simply be out of date.

Change-Id: I8dfa527e1d1f1520cefd21066802451352b573d2
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
Signed-off-by: Jimmy Brisson <jimmy.brisson@arm.com>
diff --git a/docs/design.rst b/docs/design.rst
index 5e85d6a..e78cb4c 100644
--- a/docs/design.rst
+++ b/docs/design.rst
@@ -4,8 +4,8 @@
 This document provides some details about the internals of the TF-A Tests
 design. It is incomplete at the moment.
 
-Global overview of the TF-A tests behaviour
--------------------------------------------
+High-Level Behaviour
+--------------------
 
 The EL3 firmware is expected to hand over to the TF-A tests with all secondary
 cores powered down, i.e. only the primary core should enter the TF-A tests.
@@ -221,8 +221,8 @@
 
     Buffer holding the tests output. Tests output are concatenated.
 
-Interrupts management
----------------------
+Interrupt Management
+--------------------
 
 The TF-A tests expect SGIs #0 to #7 to be available for their own usage. In
 particular, this means that Trusted World software must configure them as