Remove not-so-useful technical detail

wiki/src/install/inc/steps/mac_startup_disks.inline.html

@@ -118,9 +118,6 @@
 
    <p>[[!img install/inc/screenshots/grub.png link="no" alt="Black screen ('GNU GRUB') with Tails logo and 2 options: 'Tails' and 'Tails (Troubleshooting Mode)'."]]</p>
 
-   <p>The Boot Loader on Mac is always <em>GRUB</em>. It might be
-   different on PC.</p>
-
    <div class="bug">
    <p>If your computer displays the Boot Loader
    but then fails to start on the USB stick, it might