fix links in changelog

Author: kosack

docs/changes/2928.feature.rst

@@ -7,18 +7,18 @@ transform an event table by applying the following steps:
   attribute of the `~ctapipe.io.EventPreprocessor`)
 
 This is useful for doing the final steps of DL2 processing, and will eventually
-replace what is in `DL2EventPreprocessor` and `DL2EventLoader`, which will be
+replace what is in `~ctapipe.io.DL2EventPreprocessor` and `~ctapipe.io.DL2EventLoader`, which will be
 deprecated in a future release.
 
-The `~ctapipe.core.EventPreprocessor` also includes the ability to pre-configure
+The `~ctapipe.io.EventPreprocessor` also includes the ability to pre-configure
 itself for specific use cases by setting the ``feature_set`` option. Currently
 only two `~ctapipe.io.ProcessingFeatureSet` are implemented:
-`feature_set=dl2_irf`, which defines the transforms, event selection, and output
-features for processing simulated DL2 events, and `feature_set=custom`, which
+``feature_set=dl2_irf``, which defines the transforms, event selection, and output
+features for processing simulated DL2 events, and ``feature_set=custom``, which
 has no pre-configuration and requires all parameters to be set by the user in a
 config file.
 
-The functionality of `DL2EventLoader` can be mimicked with the following:
+The functionality of `~ctapipe.io.DL2EventLoader` can be mimicked with the following:
 
 .. code-block:: python