lnrpc: fix watchtowerrpc doc tags to enable lncli api doc generation

lnrpc/watchtowerrpc/watchtower.proto

@@ -4,10 +4,28 @@ package watchtowerrpc;
 
 option go_package = "github.com/lightningnetwork/lnd/lnrpc/watchtowerrpc";
 
+/*
+ * Comments in this file will be directly parsed into the API
+ * Documentation as descriptions of the associated method, message, or field.
+ * These descriptions should go right above the definition of the object, and
+ * can be in either block or // comment format.
+ *
+ * An RPC method can be matched to an lncli command by placing a line in the
+ * beginning of the description in exactly the following format:
+ * lncli: `methodname`
+ *
+ * Failure to specify the exact name of the command will cause documentation
+ * generation to fail.
+ *
+ * More information on how exactly the gRPC documentation is generated from
+ * this proto file can be found here:
+ * https://github.com/lightninglabs/lightning-api
+ */
+
 // Watchtower is a service that grants access to the watchtower server
 // functionality of the daemon.
 service Watchtower {
-    /* lncli: tower info
+    /* lncli: `tower info`
     GetInfo returns general information concerning the companion watchtower
     including its public key and URIs where the server is currently
     listening for clients.

lnrpc/watchtowerrpc/watchtower.swagger.json

@@ -18,7 +18,7 @@
   "paths": {
     "/v2/watchtower/server": {
       "get": {
-        "summary": "lncli: tower info\nGetInfo returns general information concerning the companion watchtower\nincluding its public key and URIs where the server is currently\nlistening for clients.",
+        "summary": "lncli: `tower info`\nGetInfo returns general information concerning the companion watchtower\nincluding its public key and URIs where the server is currently\nlistening for clients.",
         "operationId": "Watchtower_GetInfo",
         "responses": {
           "200": {

lnrpc/watchtowerrpc/watchtower_grpc.pb.go

@@ -18,7 +18,7 @@ const _ = grpc.SupportPackageIsVersion7
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
 type WatchtowerClient interface {
-	// lncli: tower info
+	// lncli: `tower info`
 	// GetInfo returns general information concerning the companion watchtower
 	// including its public key and URIs where the server is currently
 	// listening for clients.
@@ -46,7 +46,7 @@ func (c *watchtowerClient) GetInfo(ctx context.Context, in *GetInfoRequest, opts
 // All implementations must embed UnimplementedWatchtowerServer
 // for forward compatibility
 type WatchtowerServer interface {
-	// lncli: tower info
+	// lncli: `tower info`
 	// GetInfo returns general information concerning the companion watchtower
 	// including its public key and URIs where the server is currently
 	// listening for clients.