DOC: remove references to the outdated architecture.txt

As mentionned in bug #405 we continue to reference architecture.txt from
places in the doc despite this file not being packaged for many years.
Better drop the reference if it's confusing.

(cherry picked from commit 9ef75ecea129e3f77aaeb38cf5c163d0eb73742e)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit 55a92393572eeff4cee4d4de738078df83e42f98)
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed