Fix gif number For understanding origin

mpourmpoulis · mpourmpoulis · commit 25ea03fa8554 · 2020-01-26T13:03:15.000+02:00
diff --git a/doc/Operations.md b/doc/Operations.md
@@ -138,7 +138,7 @@ To illustrate this, we are going to use the `back initial` command which returns
 
 Compare
 
-![](./gif/op30.gif) 
+![](./gif/op31.gif) 
 
 With 
 
