sweet/common: remove redundant word in comment

Change-Id: I2b18c42e9799943f559142f54b5d6d51ec8aafe0
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/690795
Reviewed-by: Dmitri Shuralyov <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: David Chase <[email protected]>
Auto-Submit: Dmitri Shuralyov <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: cuishuang

sweet/common/harness.go

@@ -73,7 +73,7 @@ type RunConfig struct {
 	// By convention, this is the benchmark binary's stdout.
 	Results *os.File
 
-	// Log contains additional information information from the benchmark,
+	// Log contains additional information from the benchmark,
 	// for example for debugging.
 	//
 	// By convention, this is the benchmark binary's stderr.