Update 2024-12-19-running-spinrite-on-apple-silicon.md

Fix typo

_posts/2024-12-19-running-spinrite-on-apple-silicon.md

@@ -69,7 +69,7 @@ wine spinrite.exe # Opens the SpinRite GUI app and lets you make an ISO; close o
 Before you go fire up your QEMU emulator, first you should insert your storage media you're going to run SpinRite on,
 then _eject_ it through Finder, but leave the physical drive inserted -- yes, it needs to be not mounted to the host
 macOS operating system so that QEMU can attach to it. (Alternatively you can do `diskutil list` to see what your disk
-number -- in my case it was `/dev/disk4` -- then do `diskutil unmount /dev/disk4` to unmount it.) If you forget to do
+number is -- in my case it was `/dev/disk4` -- then do `diskutil unmount /dev/disk4` to unmount it.) If you forget to do
 this, QEMU will say `qemu-system-x86_64: Could not open '/dev/disk4': Resource busy`. Also note that after quitting
 QEMU, macOS will immediately re-mount the drive...