[wwwdocs] Document Waddress in GCC 4.2

[Gabriel Dos Reis]

Gerald Pfeifer <gerald@pfeifer.com> writes:

| On Sun, 1 Apr 2007, Manuel López-Ibáñez wrote:
| > I think you should open a PR for this, otherwise it may be forgotten.
| 
| I first wanted to get some feedback on whether this was a sensible request 
| to begin with. ;-)  Gaby kindly indicated he might have a look into this, 
| so I created PR31423 and Cc:ed the two of you.

Thanks!

-- Gaby