update warning message

Makefile

@@ -1614,7 +1614,7 @@ ifneq ($(EMSCRIPTEN_PRELOAD_FILE),1)
 	@echo "  Warning: Game files not found in '$(BASEGAME)'."
 	@echo "  They will not be packaged by Emscripten or preloaded."
 	@echo "  To run this build you must serve the game files from a web server"
-	@echo "  and provide their paths to ioquake.html as query parameters."
+	@echo "  and list their paths in ioq3-config.json."
 	@echo "  To make a build that automatically loads the game files, create a"
 	@echo "  directory called '$(BASEGAME)' and copy your game files into it, then"
 	@echo "  'emmake make clean' and rebuild."

code/web/baseq3/ioq3-config.json

@@ -10,4 +10,4 @@
         {"src": "baseq3/pak7.pk3", "dst": "/baseq3"},
         {"src": "baseq3/pak8.pk3", "dst": "/baseq3"}
     ]
-}
+}

code/web/empty/ioq3-config.json

@@ -1,3 +1,3 @@
 {
     "files": []
-}
+}