DOC: document option http-ignore-probes
This one was forgotten.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index fd68d9e..2dab50a 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -1482,6 +1482,7 @@
option forceclose (*) X X X X
-- keyword -------------------------- defaults - frontend - listen -- backend -
option forwardfor X X X X
+option http-ignore-probes (*) X X X -
option http-keep-alive (*) X X X X
option http-no-delay (*) X X X X
option http-pretend-keepalive (*) X X X X