quad: fix incorrect comment in virtual quad

quad/src/virt_quad/main.c

@@ -252,8 +252,8 @@ void usage(char *executable_name) {
   printf("Usage: %s command [ args ]\n", executable_name);
   puts("Overview:");
   puts("  The virtual quad emulates the behavior of the real quad in the Unix");
-  puts("  environment. Start the virtual quad in one tab (no arguments), and");
-  puts("  then control the I/O of the quad through commands.");
+  puts("  environment. Start the virtual quad in one tab, and then control the I/O");
+  puts("  of the virtual quad through commands.");
   puts("");
   puts("  For help on a particular command, pass the command name to the help command");
   puts("  Example:");