DOC: listeners: add a few missing transitions

Some disable() transitions were missing, and the distinction between
multi-threaded and single-threaded transitions was not mentioned.

(cherry picked from commit 4ac36d691ab40a29ec4a1fb43a3270f31114feda)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit 8b3f8dbf031f7dd05e7b717dc65704baf45d38db)
Signed-off-by: Willy Tarreau <w@1wt.eu>
2 files changed