Fix typos and improve UX

cmd/ui.go

@@ -130,7 +130,7 @@ func printExecutionDescription(
 		}
 	}
 
-	fprintf(stdout, "     output: %s\n", ui.ValueColor.Sprint(strings.Join(outputDescriptions, ";")))
+	fprintf(stdout, "     output: %s\n", ui.ValueColor.Sprint(strings.Join(outputDescriptions, ", ")))
 	fprintf(stdout, "\n")
 
 	maxDuration, _ := lib.GetEndOffset(execPlan)

core/engine.go

@@ -113,7 +113,7 @@ func NewEngine(
 
 // StartOutputs spins up all configured outputs, giving the thresholds to any
 // that can accept them. And if some output fails, stop the already started
-// ones. This may take some time, since some outpts make initial network
+// ones. This may take some time, since some outputs make initial network
 // requests to set up whatever remote services are going to listen to them.
 //
 // TODO: this doesn't really need to be in the Engine, so take it out?

output/json/json.go

@@ -67,7 +67,7 @@ func (o *Output) Description() string {
 	if o.filename == "" || o.filename == "-" {
 		return "json(stdout)"
 	}
-	return fmt.Sprintf("json(%s)", o.filename)
+	return fmt.Sprintf("json (%s)", o.filename)
 }
 
 // Start opens the tries to specified JSON file and starts the goroutine for

output/json/wrapper.go

@@ -49,8 +49,8 @@ func newJSONSample(sample stats.Sample) Sample {
 	}
 }
 
-// WrapSample is a used to package a metric sample in a way that's nice to
-// export to JSON.
+// WrapSample is used to package a metric sample in a way that's nice to export
+// to JSON.
 func WrapSample(sample stats.Sample) Envelope {
 	return Envelope{
 		Type:   "Point",