corrected saga metrics name and added to metrics documentation (#119)

* corrected saga metrics name and added documentatio

* corrected saga metric name

* corrected typos

Author: Guy Baron

docs/METRICS.md

@@ -1,9 +1,10 @@
 # Metrics
 
-grabbit exposes and reports operational the following metrics to Prometheus
+grabbit exposes and reports the following metrics to Prometheus
 
 |  Namespace    | Subsystem     | Name                              | Description                                                                 |
 | ------------- | ------------- | ----------------------------------| --------------------------------------------------------------------------- |
 | grabbit       | handler       | [name of message handler]_result  | records and counts each succesfull or failed execution of a message handler |
 | grabbit       | handler       | [name of message handler]_latency | records the execution time of each handler                                  |
 | grabbit       | messages      | rejected_messages                 | increments each time a message gets rejected                                |
+| grabbit       | saga          | timedout_sagas                   | counting the number of timedout saga instances                              |

gbus/metrics/saga_metrics.go

@@ -23,7 +23,7 @@ func newSagaTimeoutCounter() prometheus.Counter {
 	return promauto.NewCounter(prometheus.CounterOpts{
 		Namespace: grabbitPrefix,
 		Subsystem: "saga",
-		Name:      "timeedout_sagas",
+		Name:      "timedout_sagas",
 		Help:      "counting the number of timedout saga instances",
 	})
 }