Fix example image height

Author: chrisbloom7

docs/dock/largesize.md

@@ -47,7 +47,7 @@ defaults write com.apple.dock "largesize" -int "76" && killall Dock
 <img
   src="./images/largesize/76.png"
   alt="Example with value set to 76"
-  width="740" height="78" style="height: auto"
+  width="740" height="62" style="height: auto"
 />
 
 ## Read current value