[ci skip] Correction in the name of the variables that receive the callback information

Author: jlamim

user_guide_src/source/models/model.rst

@@ -212,8 +212,8 @@ this model will never validate.
 **$afterInsert**
 **$beforeUpdate**
 **$afterUpdate**
-**afterFind**
-**afterDelete**
+**$afterFind**
+**$afterDelete**
 
 These arrays allow you to specify callback methods that will be run on the data at the
 time specified in the property name.