Add comments when subclassing Any (#9732)

stdlib/distutils/command/check.pyi

@@ -6,6 +6,8 @@ from ..cmd import Command
 _Reporter: TypeAlias = Any  # really docutils.utils.Reporter
 
 # Only defined if docutils is installed.
+# Depends on a third-party stub. Since distutils is deprecated anyway,
+# it's easier to just suppress the "any subclassing" error.
 class SilentReporter(_Reporter):
     messages: Any
     def __init__(

stdlib/unittest/mock.pyi

@@ -101,6 +101,8 @@ class _CallList(list[_Call]):
 class Base:
     def __init__(self, *args: Any, **kwargs: Any) -> None: ...
 
+# We subclass with "Any" because mocks are explicitly designed to stand in for other types,
+# something that can't be expressed with our static type system.
 class NonCallableMock(Base, Any):
     def __new__(__cls, *args: Any, **kw: Any) -> Self: ...
     def __init__(