Formatting cleanups, doc updates and whatnot

Change-Id: Ica8298353be22f947c8e8a03d8dc29ded9cb26dd
diff --git a/lib/horizon b/lib/horizon
index b63e1f8..94aac5c 100644
--- a/lib/horizon
+++ b/lib/horizon
@@ -38,6 +38,10 @@
 APACHE_USER=${APACHE_USER:-$USER}
 APACHE_GROUP=${APACHE_GROUP:-$(id -gn $APACHE_USER)}
 
+
+# Functions
+# ---------
+
 # utility method of setting python option
 function _horizon_config_set() {
     local file=$1