all: remove redundant words in comment

Change-Id: I3747791b019fec0ed1108752a966551cea21a603
Reviewed-on: https://go-review.googlesource.com/c/exp/+/690815
Auto-Submit: Sean Liao <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Sean Liao <[email protected]>
Reviewed-by: David Chase <[email protected]>

Author: cuishuang

event/event_test.go

@@ -274,7 +274,7 @@ func (t *testTraceHandler) Event(ctx context.Context, ev *event.Event) context.C
 }
 
 func TestTraceDuration(t *testing.T) {
-	// Verify that a trace can can emit a latency metric.
+	// Verify that a trace can emit a latency metric.
 	dur := event.NewDuration("test", nil)
 	want := time.Second
 

event/otel/metric.go

@@ -22,7 +22,7 @@ type MetricHandler struct {
 	mu    sync.Mutex
 	// A map from event.Metrics to, effectively, otel Meters.
 	// But since the only thing we need from the Meter is recording a value, we
-	// use a function for that that closes over the Meter itself.
+	// use a function for that closes over the Meter itself.
 	recordFuncs map[event.Metric]recordFunc
 }
 

event/source.go

@@ -123,7 +123,7 @@ func (c *sources) scanStack() Source {
 		e, found := c.getCaller(pc)
 		if found {
 			if !e.helper {
-				// exact non helper match match found, return it
+				// exact non helper match found, return it
 				return e.source
 			}
 			// helper found, keep scanning

sumdb/internal/tkv/tkv.go

@@ -19,7 +19,7 @@ type Storage interface {
 
 	// ReadWrite runs f in a read-write transaction.
 	// If f returns an error, the transaction aborts and returns that error.
-	// If f returns nil, the transaction attempts to commit and then then return nil.
+	// If f returns nil, the transaction attempts to commit and then return nil.
 	// Otherwise it tries again. Note that f may be called multiple times and that
 	// the result only describes the effect of the final call to f.
 	// The caller must take care not to use any state computed during