Fix Documentation about when hook is called

You have on the front page:

WARNING: Module only call delete hooks when the node/entity is actually delete from database. However the same does not apply to update/insert since it cannot find out whether the node/entity is updated/inserted or not.

Please update this to read:

WARNING: The _postsave, _postinsert and _postupdate hooks are also called when the entity/node is deleted, as there is no way to find out whether the entity/node is actually saved/inserted/updated. However, the module does only call the delete hooks when the entity/node is actually deleted from database.