docs: fixing dead links

docs_src/references/exporter-prometheus.md

@@ -34,4 +34,4 @@ With default options values, the metrics are exposed on http://localhost:8080/me
 Use -q or --qemu option if you are running scaphandre on a hypervisor. In that case a label with the vm name will be added to all `qemu-system*` processes.
 This will allow to easily create charts consumption for each vm and defined which one is the top contributor.
 
-Metrics provided Scaphandre are documented [here](references/metrics.md).
+Metrics provided Scaphandre are documented [here](metrics.md).

docs_src/references/exporter-riemann.md

@@ -87,7 +87,7 @@ As a reference here is a Riemann configuration:
 
 ## Metrics exposed
 
-Metrics provided Scaphandre are documented [here](references/metrics.md).
+Metrics provided Scaphandre are documented [here](metrics.md).
 
 There is only one exception about `process_power_consumption_microwatts` each process has a service name `process_power_consumption_microwatts_pid_exe`.
 

docs_src/references/exporter-warp10.md

@@ -34,4 +34,4 @@ With default options values, the metrics are sent to http://localhost:8080 every
 Use -q or --qemu option if you are running scaphandre on a hypervisor. In that case a label with the vm name will be added to all `qemu-system*` processes.
 This will allow to easily create charts consumption for each vm and defined which one is the top contributor.
 
-Metrics provided Scaphandre are documented [here](references/metrics.md). 
+Metrics provided Scaphandre are documented [here](metrics.md).