remove accidental space

REFERENCE.md

@@ -48,7 +48,6 @@
 * [`prometheus::redis_exporter`](#prometheus--redis_exporter): This module manages prometheus node redis_exporter
 * [`prometheus::run_service`](#prometheus--run_service): This class is meant to be called from prometheus. It ensure the service is running
 * [`prometheus::sachet`](#prometheus--sachet): This module manages prometheus sachet (https://github.com/messagebird/sachet)
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 * [`prometheus::server`](#prometheus--server): class to manage the actual prometheus server. This class gets called from the init.pp
 * [`prometheus::snmp_exporter`](#prometheus--snmp_exporter): This module manages prometheus snmp_exporter
 * [`prometheus::ssh_exporter`](#prometheus--ssh_exporter): This module manages prometheus ssh_exporter (https://github.com/treydock/ssh_exporter)