fix(storage): Same method name and Trace Span name (#8150)

I think the method name and the Trace Span Name are expected to be the same, so I fixed that.

Author: sinmetal

storage/bucket.go

@@ -152,7 +152,7 @@ func (b *BucketHandle) Attrs(ctx context.Context) (attrs *BucketAttrs, err error
 
 // Update updates a bucket's attributes.
 func (b *BucketHandle) Update(ctx context.Context, uattrs BucketAttrsToUpdate) (attrs *BucketAttrs, err error) {
-	ctx = trace.StartSpan(ctx, "cloud.google.com/go/storage.Bucket.Create")
+	ctx = trace.StartSpan(ctx, "cloud.google.com/go/storage.Bucket.Update")
 	defer func() { trace.EndSpan(ctx, err) }()
 
 	isIdempotent := b.conds != nil && b.conds.MetagenerationMatch != 0