FYI: small updates on GDB Coding Style wiki

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

Just FYI - I merged my old "GDB Coding Style Cheat Sheet" wiki page
into the official "GDB C Coding Standard" page, and deleted mine
afterwards. Since the wiki is now the official repository for
documenting our coding standards, I didn't the reason for keeping
my own page.  While doing so, I reformatted a bit the original page,
doing the following:
  - Added a Table of Contents;
  - used subsections to plit each rule or set of rule;

The objectives where to make it easier to navigate the document when
in search of a specific rule. I also wanted to separte each rule more
so that one small but important rule does not get drown between other
rules, and therefore missed.

-- 
Joel