Fix some typos found by codespell

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/ui/cocoa.m b/ui/cocoa.m
index 60a7c07..36c6bf0 100644
--- a/ui/cocoa.m
+++ b/ui/cocoa.m
@@ -1394,7 +1394,7 @@
     [menuItem setEnabled: NO];
     [menu addItem: menuItem];
 
-    /* Loop thru all the block devices in the emulator */
+    /* Loop through all the block devices in the emulator */
     while (currentDevice) {
         deviceName = [[NSString stringWithFormat: @"%s", currentDevice->value->device] retain];