Removed some duplicated Livecycle docs

The list is also included in the doctrine docs. There is no need to
duplicate that in the sf docs. And if it's usefull, it certainly isn't
when there is no more documentation about their meaning.

book/doctrine.rst

@@ -1265,7 +1265,7 @@ stages of the lifecycle of an entity (e.g. the entity is inserted, updated,
 deleted, etc).
 
 If you're using annotations for your metadata, start by enabling the lifecycle
-callbacks. This is not necessary if you're using YAML or XML for your mapping:
+callbacks. This is not necessary if you're using YAML or XML for your mapping.
 
 .. code-block:: php-annotations
 
@@ -1328,20 +1328,8 @@ the current date, only when the entity is first persisted (i.e. inserted):
 
 Now, right before the entity is first persisted, Doctrine will automatically
 call this method and the ``createdAt`` field will be set to the current date.
-
-This can be repeated for any of the other lifecycle events, which include:
-
-* ``preRemove``
-* ``postRemove``
-* ``prePersist``
-* ``postPersist``
-* ``preUpdate``
-* ``postUpdate``
-* ``postLoad``
-* ``loadClassMetadata``
-
-For more information on what these lifecycle events mean and lifecycle callbacks
-in general, see Doctrine's `Lifecycle Events documentation`_
+For more information on other lifecycle events and lifecycle callbacks in
+general, see Doctrine's `Lifecycle Events documentation`_.
 
 .. sidebar:: Lifecycle Callbacks and Event Listeners