doc: Fix platform port inclusion

This patch:

- Adds any leftover platform ports that were not having their
  documentation built (not in the index.rst table of contents)
- Corrects a handful of RST formatting errors that cause poor
  rendering
- Reorders the list of platforms so that they are displayed
  in alphabetical order

Change-Id: If8c135a822d581c3c5c4fca2936d501ccfd2e94c
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
diff --git a/docs/plat/hikey.rst b/docs/plat/hikey.rst
index 74ff2f4..372d388 100644
--- a/docs/plat/hikey.rst
+++ b/docs/plat/hikey.rst
@@ -1,15 +1,15 @@
-Description
-===========
+HiKey
+=====
 
 HiKey is one of 96boards. Hisilicon Kirin6220 processor is installed on HiKey.
 
 More information are listed in `link`_.
 
 How to build
-============
+------------
 
 Code Locations
---------------
+~~~~~~~~~~~~~~
 
 -  Trusted Firmware-A:
    `link <https://github.com/ARM-software/arm-trusted-firmware>`__
@@ -33,7 +33,7 @@
    `link <https://github.com/96boards-hikey/atf-fastboot/tree/master>`__
 
 Build Procedure
----------------
+~~~~~~~~~~~~~~~
 
 -  Fetch all the above repositories into local host.
    Make all the repositories in the same ${BUILD\_PATH}.