Merge pull request #3477 from rkho/patch-2

Fixed misspelling in mixin.js

lib/associations/mixin.js

@@ -16,7 +16,7 @@ var Utils = require('./../utils')
  *
  *
  * Creating an association will add a foreign key constraint to the attributes. All associations use `CASCADE` on update and `SET NULL` on delete, except for n:m, which also uses `CASCADE` on delete.
  * Creating an association will add a foreign key constraint to the attributes. All associations use `CASCADE` on update and `SET NULL` on delete, except for n:m, which also uses `CASCADE` on delete.
  *
  *
- * When creating associations, you can provide an alias, via the `as` option. This is usefull if the same model
+ * When creating associations, you can provide an alias, via the `as` option. This is useful if the same model
  * is associated twice, or you want your association to be called something other than the name of the target model.
  * is associated twice, or you want your association to be called something other than the name of the target model.
  * As an example, consider the case where users have many pictures, one of which is their profile picture. All pictures
  * As an example, consider the case where users have many pictures, one of which is their profile picture. All pictures
  * have a `userId`, but in addition the user model also has a `profilePictureId`, to be able to easily load the user's profile
  * have a `userId`, but in addition the user model also has a `profilePictureId`, to be able to easily load the user's profile