Applied reviewer suggestion

Author: murilolobato

reference/forms/types/collection.rst

@@ -276,9 +276,9 @@ the empty values will be kept.
 .. caution::
 
     The ``delete_empty`` option only removes items when the normalized value is
-    ``null``. If your `type`_ is a compound form type, you must either set the
-    ``required`` option to ``false`` or set the ``empty_data`` option to ``null``.
-    Both of these options can be set inside `options`_. See
+    ``null``. If the nested `type`_ is a compound form type, you must either set
+    the ``required`` option to ``false`` or set the ``empty_data`` option to 
+    ``null``. Both of these options can be set inside `options`_. See
     :ref:`form's empty_data option <reference-form-option-empty-data>` to learn
     why this is necessary.