Fix typo in prometheus/alertmanager/init.yml

Change-Id: Id9eacacd4699fa0bb0b5cdbb22452a7e0fa4bb53
diff --git a/prometheus/alertmanager/init.yml b/prometheus/alertmanager/init.yml
index e7ba562..b00a4b9 100644
--- a/prometheus/alertmanager/init.yml
+++ b/prometheus/alertmanager/init.yml
@@ -1,4 +1,4 @@
 parameters:
   _param:
-    prometheus_alermanager_config_directory: /srv/alertmanager
-    prometheus_alermanager_data_directory: /data
+    prometheus_alertmanager_config_directory: /srv/alertmanager
+    prometheus_alertmanager_data_directory: /data