cmd/lncli: make hop hint inclusion opt-in for addinvoice

Fixes #6484.

cmd/lncli/cmd_invoice.go

@@ -60,7 +60,7 @@ var addInvoiceCommand = cli.Command{
 				"specified an expiry of 3600 seconds (1 hour) " +
 				"is implied.",
 		},
-		cli.BoolTFlag{
+		cli.BoolFlag{
 			Name: "private",
 			Usage: "encode routing hints in the invoice with " +
 				"private channels in order to assist the " +

docs/release-notes/release-notes-0.15.0.md

@@ -54,6 +54,10 @@ releases. Backward compatibility is not guaranteed!
 * Add [--socksproxy](https://github.com/lightningnetwork/lnd/pull/6422)
   to allow for RPC calls via Tor.
 
+* [Hop hints are now opt in when using `lncli
+  addinvoice`]https://github.com/lightningnetwork/lnd/pull/6523). Users now
+  need to explicitly specify the `--private` flag.
+
 ## Neutrino
 
 [Neutrino now suports BIP