fix: typo in CSS for the tutorial (#1436)

fix typo

Co-authored-by: ComputerGuy <[email protected]>

Author: teemingc

apps/svelte.dev/content/tutorial/+assets/static/shared.css

@@ -189,7 +189,7 @@ progress:first-child {
 	margin-top: 0;
 }
 
-progress:lsat-child {
+progress:last-child {
 	margin-bottom: 0;
 }
 

apps/svelte.dev/scripts/create-tutorial-zip/common/src/app.html

@@ -198,7 +198,7 @@
 				margin-top: 0;
 			}
 
-			progress:lsat-child {
+			progress:last-child {
 				margin-bottom: 0;
 			}
 

apps/svelte.dev/static/tutorial/shared.css

@@ -197,7 +197,7 @@ progress:first-child {
 	margin-top: 0;
 }
 
-progress:lsat-child {
+progress:last-child {
 	margin-bottom: 0;
 }