docs: add note to make_class about non-NG-ness

fixes #1375

Author: hynek

src/attr/_make.py

@@ -2868,10 +2868,19 @@ def make_class(
     r"""
     A quick way to create a new class called *name* with *attrs*.
 
+    .. note::
+
+        This function is a thin wrapper around `attr.s`, not `attrs.define`
+        which means that it doesn't come with some of the improved defaults.
+
+        For example, if you want the same `on_setattr` behavior as in
+        `attrs.define`, you have to pass the hooks yourself: ``make_class(...,
+        on_setattr=setters.pipe(setters.convert, setters.validate)``
+
     Args:
         name (str): The name for the new class.
 
-        attrs( list | dict):
+        attrs (list | dict):
             A list of names or a dictionary of mappings of names to `attr.ib`\
             s / `attrs.field`\ s.