Correct README

Change-Id: I74d1cc6a7cbdce6893f756c59a871da3a57d63b1

README.md

diff --git a/README.md b/README.md
index c6ab056..ef81595 100644
--- a/README.md
+++ b/README.md
@@ -112,7 +112,7 @@
     server gerrit_http_01 gerrit-01.mycompany.com:8080 check inter 10s
     server gerrit_http_02 gerrit-01.mycompany.com:8080 check inter 10s backup
 
-ackend ssh
+backend gerrit_ssh_nodes
     mode tcp
     option httpchk GET /config/server/version HTTP/1.0
     http-check expect status 200