84c4e7451e
The peers protocol has been using "HAProxyS" as a binary tag sent on the wire since day one in 1.5-dev3 with commit 2b920a1af ("[MAJOR] Add new files src/peer.c, include/proto/peers.h and include/types/peers.h for sync stick table management"), regardless, the doc says the protocol identifier is "HaproxyS". It is likely this got fixed in the code before merging and not in the doc. This should be backported to any release as the doc is wrong.