Maelstrom: Updated the command line help with the -windowed option

https://github.com/libsdl-org/Maelstrom/commit/520835d45ab95cbb9ce070c4a585d02a1cadcf3e

From 520835d45ab95cbb9ce070c4a585d02a1cadcf3e Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 17 Nov 2022 00:21:28 -0800
Subject: [PATCH] Updated the command line help with the -windowed option

---
 main.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/main.cpp b/main.cpp
index 087a0bf..732e9f2 100644
--- a/main.cpp
+++ b/main.cpp
@@ -153,7 +153,7 @@ void PrintUsage(void)
 	error("or\n");
 	error("Usage: %s <options>\n\n", progname);
 	error("Where <options> can be any of:\n\n"
-"	-fullscreen		# Run Maelstrom in full-screen mode\n"
+"	-windowed		# Run Maelstrom in windowed mode\n"
 "	-gamma [0-8]		# Set the gamma correction\n"
 "	-volume [0-8]		# Set the sound volume\n"
 "	-netscores		# Use the world-wide network score server\n"