Fixed a fixme + some spelling stuff

docs/reference/celery.signals.rst

@@ -5,7 +5,7 @@ Signals - celery.signals
 .. data:: task_sent
 
     Triggered when a task has been sent to the broker.
-    Please note that this is executed in the client, the process sending
+    Note that this is executed in the client process, the one sending
     the task, not in the worker.
 
     Provides arguments:

docs/userguide/executing.rst

@@ -68,9 +68,9 @@ using time in seconds is not very readable.
 Serializers
 -----------
 
-Data passed between celery and worker daemons are serialized FIXME
-
-The default serializer is :mod:`pickle`, but you can change this for each
+Data passed between celery and workers has to be serialized to be
+transferred. The default serializer is :mod:`pickle`, but you can 
+change this for each
 task. There is built-in support for using ``pickle``, ``JSON`` and ``YAML``,
 and you can add your own custom serializers by registering them into the
 carrot serializer registry.