DOC: simplify dtype inference note in DataFrame.apply

Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>

Author: pranavkp71

pandas/core/frame.py

@@ -10632,9 +10632,7 @@ def apply(
          .. warning::
 
             When ``raw=True``, the result dtype is inferred from the **first**
-            returned value. If that value is not ``None`` but later calls return
-            ``None``, a ``TypeError`` may occur because NumPy infers a
-            non-nullable dtype.
+            returned value.
 
         result_type : {'expand', 'reduce', 'broadcast', None}, default None
             These only act when ``axis=1`` (columns):