move toplevel comment

Author: zhouselena

internal/cmd/perfcomp/main.go

@@ -6,6 +6,9 @@
 
 package main
 
+// This module cannot be included in the workspace since it requires a version of Gonum that is not compatible with the Go Driver.
+// Must use GOWORK=off to run this test.
+
 import (
 	"context"
 	"fmt"
@@ -21,9 +24,6 @@ import (
 	"gonum.org/v1/gonum/mat"
 )
 
-// This module cannot be included in the workspace since it requires a version of Gonum that is not compatible with the Go Driver.
-// Must use GOWORK=off to run this test.
-
 type OverrideInfo struct {
 	OverrideMainline bool        `bson:"override_mainline"`
 	BaseOrder        interface{} `bson:"base_order"`