Remove a few references to 'Stub'

modal/app.py

@@ -158,8 +158,7 @@ def f(x, y):
 
 
 class _App:
-    """A Modal app (prior to April 2024 a "stub") is a group of functions and classes
-    deployed together.
+    """A Modal App is a group of functions and classes that are deployed together.
 
     The app serves at least three purposes:
 
@@ -1083,7 +1082,8 @@ def _reset_container_app(cls):
 
 
 class _Stub(_App):
-    """This enables using an "Stub" class instead of "App".
+    """mdmd:hidden
+    This enables using an "Stub" class instead of "App".
 
     For most of Modal's history, the app class was called "Stub", so this exists for
     backwards compatibility, in order to facilitate moving from "Stub" to "App".

modal/functions.py

@@ -299,8 +299,7 @@ class _Function(typing.Generic[P, ReturnType, OriginalReturnType], _Object, type
     """Functions are the basic units of serverless execution on Modal.
 
     Generally, you will not construct a `Function` directly. Instead, use the
-    `@app.function()` decorator on the `App` object (formerly called "Stub")
-    for your application.
+    `App.function()` decorator to register your Python functions with your App.
     """
 
     # TODO: more type annotations