lnrpc: replace /// and /** with // and /*

lnrpc/lnclipb/lncli.proto

@@ -7,9 +7,9 @@ package lnclipb;
 option go_package = "github.com/lightningnetwork/lnd/lnrpc/lnclipb";
 
 message VersionResponse {
-    /// The version information for lncli.
+    // The version information for lncli.
     verrpc.Version lncli = 1;
 
-    /// The version information for lnd.
+    // The version information for lnd.
     verrpc.Version lnd = 2;
 };