add package comment

pkg/process/net/common_all.go

@@ -0,0 +1,7 @@
+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2024-present Datadog, Inc.
+
+// Package net provides local access to system probe
+package net