one last tabs / spaces!

Author: phalt

docs/tutorial/1-serialization.md

@@ -365,7 +365,7 @@ Finally, we can get a list of all of the snippets:
 
 Or we can get a particular snippet by referencing its id:
 
-	http http://127.0.0.1:8000/snippets/2/
+    http http://127.0.0.1:8000/snippets/2/
 
     HTTP/1.1 200 OK
     ...