misc: fix error formatting in multiple files

htlcswitch/decayedlog.go

@@ -93,7 +93,7 @@ func (d *DecayedLog) Start() error {
 		kvdb.BoltBackendName, d.dbPath, true,
 	)
 	if err != nil {
-		return fmt.Errorf("Could not open boltdb: %v", err)
+		return fmt.Errorf("could not open boltdb: %v", err)
 	}
 
 	// Initialize the primary buckets used by the decayed log.
@@ -105,7 +105,7 @@ func (d *DecayedLog) Start() error {
 	if d.notifier != nil {
 		epochClient, err := d.notifier.RegisterBlockEpochNtfn(nil)
 		if err != nil {
-			return fmt.Errorf("Unable to register for epoch "+
+			return fmt.Errorf("unable to register for epoch "+
 				"notifications: %v", err)
 		}