doc: Normalise section numbering and headings

Required work to make all documents sit at the correct levels within
the document tree and any derived content like the table of contents
and the categories in the sidebar.

Change-Id: I4885fbe30864a87c8822ee67482b71fb46a8fbc6
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

docs/components/romlib-design.rst

 Library at ROM
 ==============
 
-.. section-numbering::
-    :suffix: .
-
 .. contents::
 
 This document provides an overview of the "library at ROM" implementation in

docs/components/spd/index.rst

@@ -4,7 +4,6 @@ Secure Payload Dispatcher (SPD)
 .. toctree::
    :maxdepth: 1
    :caption: Contents
-   :numbered:
 
    optee-dispatcher
    tlk-dispatcher

docs/components/spd/tlk-dispatcher.rst

@@ -15,7 +15,7 @@ Once a BL32 is ready, TLKD can be included in the image by adding "SPD=tlkd"
 to the build command.
 
 Trusted Little Kernel (TLK)
-===========================
+---------------------------
 
 TLK is a Trusted OS running as Secure EL1. It is a Free Open Source Software
 (FOSS) release of the NVIDIA® Trusted Little Kernel (TLK) technology, which
@@ -54,20 +54,20 @@ TLK and OTE can be found in the Tegra\_BSP\_for\_Android\_TLK\_FOSS\_Reference.p
 manual located under the "documentation" directory\_.
 
 Build TLK
-=========
+---------
 
 To build and execute TLK, follow the instructions from "Building a TLK Device"
 section from Tegra\_BSP\_for\_Android\_TLK\_FOSS\_Reference.pdf manual.
 
 Input parameters to TLK
-=======================
+-----------------------
 
 TLK expects the TZDRAM size and a structure containing the boot arguments. BL2
 passes this information to the EL3 software as members of the bl32\_ep\_info
 struct, where bl32\_ep\_info is part of bl31\_params\_t (passed by BL2 in X0)
 
-Example:
---------
+Example
+~~~~~~~
 
 ::
 

docs/components/spd/trusty-dispatcher.rst

@@ -9,7 +9,7 @@ Open Source Project (AOSP) webpage for Trusty hosted at
 https://source.android.com/security/trusty
 
 Boot parameters
-===============
+---------------
 
 Custom boot parameters can be passed to Trusty by providing a platform
 specific function:
@@ -26,7 +26,7 @@ can be set to a platform specific parameter block, and ``args->arg2``
 should then be set to the size of that block.
 
 Supported platforms
-===================
+-------------------
 
 Out of all the platforms supported by Trusted Firmware-A, Trusty is only
 verified and supported by NVIDIA's Tegra SoCs.

docs/getting_started/image-terminology.rst

 Image Terminology
 =================
 
-.. section-numbering::
-    :suffix: .
-
 .. contents::
 
 This page contains the current name, abbreviated name and purpose of the various

docs/process/release-information.rst

 Release Processes
 =================
 
-.. section-numbering::
-    :suffix: .
-
 .. contents::
 
 --------------