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/poplar.rst b/docs/plat/poplar.rst
index 5884ed9..215f551 100644
--- a/docs/plat/poplar.rst
+++ b/docs/plat/poplar.rst
@@ -1,5 +1,5 @@
-Description
-===========
+Poplar
+======
 
 Poplar is the first development board compliant with the 96Boards Enterprise
 Edition TV Platform specification.
@@ -35,10 +35,10 @@
     l-loader --> Trusted Firmware-A --> u-boot
 
 How to build
-============
+------------
 
 Code Locations
---------------
+~~~~~~~~~~~~~~
 
 -  Trusted Firmware-A:
    `link <https://github.com/ARM-software/arm-trusted-firmware>`__
@@ -50,7 +50,7 @@
    `link <http://git.denx.de/u-boot.git>`__
 
 Build Procedure
----------------
+~~~~~~~~~~~~~~~
 
 -  Fetch all the above 3 repositories into local host.
    Make all the repositories in the same ${BUILD\_PATH}.
@@ -89,7 +89,7 @@
 working firmware to eMMC.
 
 Boot trace
-==========
+----------
 
 ::