Add Backpex.Fields.Email to list of supported index edit fields

Author: Flo0807

guides/fields/index-edit.md

@@ -26,10 +26,11 @@ The example above will enable index editable for the `name` text field.
 - `Backpex.Fields.BelongsTo`
 - `Backpex.Fields.Date`
 - `Backpex.Fields.DateTime`
+- `Backpex.Fields.Email`
 - `Backpex.Fields.Number`
 - `Backpex.Fields.Select`
 - `Backpex.Fields.Text`
 
 ## Custom index editable implementation
 
-You can add index editable support to your custom fields by defining the [render_index_form/1](Backpex.Field.html#c:render_index_form/1) function and enabling index editable for your field.
+You can add index editable support to your custom fields by defining the [render_index_form/1](Backpex.Field.html#c:render_index_form/1) function and enabling index editable for your field.