lnrpc: add lncli command hint for API docs generator

diff --git a/lnrpc/walletrpc/walletkit.proto b/lnrpc/walletrpc/walletkit.proto
index b50d2d6..a9d6ee0 100644
--- a/lnrpc/walletrpc/walletkit.proto
+++ b/lnrpc/walletrpc/walletkit.proto
@@ -328,7 +328,7 @@ service WalletKit {
     */
     rpc FundPsbt (FundPsbtRequest) returns (FundPsbtResponse);
 
-    /*
+    /* lncli: `wallet psbt sign`
     SignPsbt expects a partial transaction with all inputs and outputs fully
     declared and tries to sign all unsigned inputs that have all required fields
     (UTXO information, BIP32 derivation information, witness or sig scripts)
diff --git a/lnrpc/walletrpc/walletkit.swagger.json b/lnrpc/walletrpc/walletkit.swagger.json
index 1e8e074..bb9ae5e 100644
--- a/lnrpc/walletrpc/walletkit.swagger.json
+++ b/lnrpc/walletrpc/walletkit.swagger.json
@@ -507,7 +507,7 @@
     },
     "/v2/wallet/psbt/sign": {
       "post": {
-        "summary": "SignPsbt expects a partial transaction with all inputs and outputs fully\ndeclared and tries to sign all unsigned inputs that have all required fields\n(UTXO information, BIP32 derivation information, witness or sig scripts)\nset.\nIf no error is returned, the PSBT is ready to be given to the next signer or\nto be finalized if lnd was the last signer.",
+        "summary": "lncli: `wallet psbt sign`\nSignPsbt expects a partial transaction with all inputs and outputs fully\ndeclared and tries to sign all unsigned inputs that have all required fields\n(UTXO information, BIP32 derivation information, witness or sig scripts)\nset.\nIf no error is returned, the PSBT is ready to be given to the next signer or\nto be finalized if lnd was the last signer.",
         "description": "NOTE: This RPC only signs inputs (and only those it can sign), it does not\nperform any other tasks (such as coin selection, UTXO locking or\ninput/output/fee value validation, PSBT finalization). Any input that is\nincomplete will be skipped.",
         "operationId": "WalletKit_SignPsbt",
         "responses": {
diff --git a/lnrpc/walletrpc/walletkit_grpc.pb.go b/lnrpc/walletrpc/walletkit_grpc.pb.go
index 579aa47..4cd79a4 100644
--- a/lnrpc/walletrpc/walletkit_grpc.pb.go
+++ b/lnrpc/walletrpc/walletkit_grpc.pb.go
@@ -254,6 +254,7 @@ type WalletKitClient interface {
 	// publishing the transaction) or to unlock/release the locked UTXOs in case of
 	// an error on the caller's side.
 	FundPsbt(ctx context.Context, in *FundPsbtRequest, opts ...grpc.CallOption) (*FundPsbtResponse, error)
+	// lncli: `wallet psbt sign`
 	// SignPsbt expects a partial transaction with all inputs and outputs fully
 	// declared and tries to sign all unsigned inputs that have all required fields
 	// (UTXO information, BIP32 derivation information, witness or sig scripts)
@@ -779,6 +780,7 @@ type WalletKitServer interface {
 	// publishing the transaction) or to unlock/release the locked UTXOs in case of
 	// an error on the caller's side.
 	FundPsbt(context.Context, *FundPsbtRequest) (*FundPsbtResponse, error)
+	// lncli: `wallet psbt sign`
 	// SignPsbt expects a partial transaction with all inputs and outputs fully
 	// declared and tries to sign all unsigned inputs that have all required fields
 	// (UTXO information, BIP32 derivation information, witness or sig scripts)