added 3d gizmos description to 3d intro (#1829)

* added 3d gizmos description to 3d intro

* Fixup

tutorials/3d/introduction_to_3d.rst

@@ -164,11 +164,18 @@ Some useful keybindings:
 View menu
 ---------
 
-The view options are controlled by the "[ view ]" menu. Pay attention to
-this little menu inside the window because it is often overlooked!
+The view options are controlled by the "View" menu in the viewport's toolbar.
 
 .. image:: img/tuto_3d6.png
 
+You can hide the gizmos in the 3D view of the editor through this menu:
+
+.. image:: img/tuto_3d6_1.png
+
+To hide a specific type of gizmos, you can toggle them off in the "View" menu.
+ 
+.. image:: img/tuto_3d6_2.png
+
 Default environment
 -------------------