Merging emphasized notes

Merged both notes into one, in accordance to discussion feedback.

Author: kshishkin

cookbook/form/form_collections.rst

@@ -462,11 +462,10 @@ these new ``Tag`` objects easier (especially if you're using Doctrine, which
 we talk about next!).
 
 .. caution::
-    Create **both** methods, otherwise none of them will be used.
-    
-    If no ``addTag`` **and** ``removeTag`` method is found, the form will
-    still use ``setTag`` even if ``by_reference`` is ``false``. You'll learn
-    more about the ``removeTag`` method later in this article.
+
+    You have to create **both** ``addTag`` and ``removeTag`` methods, 
+    otherwise the form will still use ``setTag`` even if ``by_reference`` is ``false``. 
+    You'll learn more about the ``removeTag`` method later in this article.
 
 .. sidebar:: Doctrine: Cascading Relations and saving the "Inverse" side