Fix wrong directive names in action documentation

Refs #739

doc/Configuration-reference.md

@@ -235,12 +235,14 @@ Customize the list of actions for this view. You can pass a list of button names
 
     Alternately, if you pass a string, it is compiled just like an Angular template, with access to the current `entry` in the scope. This allows to easily add custom actions, or customize the buttons appearance:
 
-        var template = '<show-button entry="entry" entity="entity" size="sm"></show-button>' +
-            '<delete-button entry="entry" entity="entity" size="sm"></delete-button>' +
+        var template = '<ma-show-button entry="entry" entity="entity" size="sm"></ma-show-button>' +
+            '<ma-delete-button entry="entry" entity="entity" size="sm"></ma-delete-button>' +
             '<my-custom-directive entry="entry"></my-custom-directive>' +
-            '<back-button></back-button>';
+            '<ma-back-button></ma-back-button>';
         editionView.actions(template);
 
+    Check the [Reusable Directives documentation](Configuration-reference.md) to get a list of ng-admin directives that you can use as actions.
+
 * `disable()`
 Disable this view. Useful e.g. to disable views that modify data and only leave the `listView` enabled
 
@@ -323,10 +325,12 @@ Add an action column with action buttons on each line. You can pass a list of bu
 
     Alternately, if you pass a string, it is compiled just like an Angular template, with access to the current `entry` in the scope. This allows to add custom actions on each line:
 
-        var template = '<show-button entry="entry" entity="entity" size="xs"></show-button>' +
+        var template = '<ma-show-button entry="entry" entity="entity" size="xs"></ma-show-button>' +
                    '<my-custom-directive entry="entry"></my-custom-directive>';
         listView.listActions(template);
 
+    Check the [Reusable Directives documentation](Configuration-reference.md) to get a list of ng-admin directives that you can use as list actions.
+
 * `batchActions(String|Array)`
 Add your own batch action directives.