update the "Usage: error message" for socket-file

Author: satyajanga

lldb/tools/lldb-server/lldb-platform.cpp

@@ -97,9 +97,10 @@ static void signal_handler(int signo) {
 #endif
 
 static void display_usage(const char *progname, const char *subcommand) {
-  fprintf(stderr, "Usage:\n  %s %s [--log-file log-file-name] [--log-channels "
-                  "log-channel-list] [--port-file port-file-path] --server "
-                  "--listen port\n",
+  fprintf(stderr,
+          "Usage:\n  %s %s [--log-file log-file-name] [--log-channels "
+          "log-channel-list] [--socket-file socket-file-path] --server "
+          "--listen port\n",
           progname, subcommand);
   exit(0);
 }