safesocket: delete incorrect build tag
Leftover from copying one file to another to create safesocket.go
in the earlier documentation change (29f7d640910f8c37b5).
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
-// +build !windows
-
// Package safesocket creates either a Unix socket, if possible, or
// otherwise a localhost TCP connection.
package safesocket
