Merge branch 'web/10625-mac-restart' (Closes: #10625)

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

    <p class="mac">Immediately press-and-hold the
-   <span class="keycap">Option</span> key until a list of possible startup
+   <span class="keycap">Option</span> key (<span class="keycap">Alt</span> key) until a list of possible startup
    disks appears.</p>
 
+   [[!img install/mac/option_key.png class="screenshot" link="no"]]
+
    <p class="mac">Choose the USB stick and press
    <span class="keycap">Enter</span>. The USB stick appears as an external hard
-   disk and might be labelled <span class="guilabel">EFI</span> or
+   disk and might be labelled <span class="guilabel">EFI Boot</span> or
    <span class="guilabel">Windows</span> like in the following screenshot:</p>
 
    [[!img install/inc/screenshots/mac_startup_usb.png class="screenshot mac" link="no" alt="Screen with the logo of an internal hard disk labelled 'Macintosh HD' and an external hard disk labelled 'Windows' (selected)"]]

wiki/src/install/inc/steps/restart_first_time.inline.mdwn

@@ -37,9 +37,11 @@ from a Tails DVD in a similar way.</p>
 1. Switch on the computer.
 
    <p class="mac-dvd">Immediately press-and-hold the
-   <span class="keycap">Option</span> key until a list of possible startup
+   <span class="keycap">Option</span> key (<span class="keycap">Alt</span> key) until a list of possible startup
    disks appears.</p>
 
+   [[!img install/mac/option_key.png class="screenshot mac-dvd" link="no"]]
+
    <p class="mac-dvd">Choose the DVD and press
    <span class="keycap">Enter</span>. The DVD
    might be labelled <span class="guilabel">Windows</span> like in the following screenshot:</p>