docs: just joining lines together nicely

Author: kenjis

user_guide_src/source/models/model.rst

@@ -740,18 +740,17 @@ Defining Callbacks
 
 You specify the callbacks by first creating a new class method in your model to use.
 
-This class method will always
-receive a ``$data`` array as its only parameter.
-
-The exact contents of the ``$data`` array will vary between events, but
-will always contain a key named ``data`` that contains the primary data passed to the original method.
-In the case
-of the **insert*()** or **update*()** methods, that will be the key/value pairs that are being inserted into the database.
-The
-main ``$data`` array will also contain the other values passed to the method, and be detailed in `Event Parameters`_.
-
-The callback method
-must return the original ``$data`` array so other callbacks have the full information.
+This class method will always receive a ``$data`` array as its only parameter.
+
+The exact contents of the ``$data`` array will vary between events, but will always
+contain a key named ``data`` that contains the primary data passed to the original
+method. In the case of the **insert*()** or **update*()** methods, that will be
+the key/value pairs that are being inserted into the database. The main ``$data``
+array will also contain the other values passed to the method, and be detailed
+in `Event Parameters`_.
+
+The callback method must return the original ``$data`` array so other callbacks
+have the full information.
 
 .. literalinclude:: model/050.php