all: gofmt for Go 1.19

Updates #5210

Change-Id: Ib02cd5e43d0a8db60c1f09755a8ac7b140b670be
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

tempfork/gliderlabs/ssh/doc.go

@@ -10,29 +10,29 @@ use crypto/ssh for building SSH clients.
 ListenAndServe starts an SSH server with a given address, handler, and options. The
 handler is usually nil, which means to use DefaultHandler. Handle sets DefaultHandler:
 
-  ssh.Handle(func(s ssh.Session) {
-      io.WriteString(s, "Hello world\n")
-  })
+	ssh.Handle(func(s ssh.Session) {
+	    io.WriteString(s, "Hello world\n")
+	})
 
-  log.Fatal(ssh.ListenAndServe(":2222", nil))
+	log.Fatal(ssh.ListenAndServe(":2222", nil))
 
 If you don't specify a host key, it will generate one every time. This is convenient
 except you'll have to deal with clients being confused that the host key is different.
 It's a better idea to generate or point to an existing key on your system:
 
-  log.Fatal(ssh.ListenAndServe(":2222", nil, ssh.HostKeyFile("/Users/progrium/.ssh/id_rsa")))
+	log.Fatal(ssh.ListenAndServe(":2222", nil, ssh.HostKeyFile("/Users/progrium/.ssh/id_rsa")))
 
 Although all options have functional option helpers, another way to control the
 server's behavior is by creating a custom Server:
 
-  s := &ssh.Server{
-      Addr:             ":2222",
-      Handler:          sessionHandler,
-      PublicKeyHandler: authHandler,
-  }
-  s.AddHostKey(hostKeySigner)
+	s := &ssh.Server{
+	    Addr:             ":2222",
+	    Handler:          sessionHandler,
+	    PublicKeyHandler: authHandler,
+	}
+	s.AddHostKey(hostKeySigner)
 
-  log.Fatal(s.ListenAndServe())
+	log.Fatal(s.ListenAndServe())
 
 This package automatically handles basic SSH requests like setting environment
 variables, requesting PTY, and changing window size. These requests are