runtime: fix typo in histogram.go

indicies -> indices

Change-Id: Ia50ae5918fc7a53c23590a94a18087a99bfd9bb7
GitHub-Last-Rev: 98eb724
GitHub-Pull-Request: #44095
Reviewed-on: https://go-review.googlesource.com/c/go/+/289529
Reviewed-by: Ian Lance Taylor <[email protected]>
Trust: Keith Randall <[email protected]>

Author: Ikko Ashimine

src/runtime/histogram.go

@@ -26,7 +26,7 @@ const (
 	// The number of super-buckets (timeHistNumSuperBuckets), on the
 	// other hand, defines the range. To reserve room for sub-buckets,
 	// bit timeHistSubBucketBits is the first bit considered for
-	// super-buckets, so super-bucket indicies are adjusted accordingly.
+	// super-buckets, so super-bucket indices are adjusted accordingly.
 	//
 	// As an example, consider 45 super-buckets with 16 sub-buckets.
 	//