Update windows further steps

src/packager/PackagerOptions.svelte

@@ -489,7 +489,8 @@
       {#if $options.target.includes('win')}
         <div>
           <h2>{$_('win.furtherSteps')}</h2>
-          <p>To change the executable icon or create an installer program, download and run <a href="https://github.com/TurboWarp/packager-extras/releases">TurboWarp Packager Extras</a> and select the output of this website.</p>
+          <p>To change the icon of the executable file or create an installer program, download and run <a href="https://github.com/TurboWarp/packager-extras/releases">TurboWarp Packager Extras</a> and select the output of this website.</p>
+          <p>All Windows applications generated by this site are unsigned, so users may see SmartScreen warnings when they try to launch it for the first time.</p>
           {#if $options.target.endsWith('64')}
             <p>The application will only run on 64-bit x86 computers.</p>
           {:else if $options.target.endsWith('32')}