[re] Improve comment about using Any for findall() (#16074)

Author: relikd

stdlib/re.pyi

@@ -169,7 +169,7 @@ class Pattern(Generic[AnyStr]):
     @overload
     def split(self, string: AnyStr, maxsplit: int = 0) -> list[AnyStr | MaybeNone]: ...
 
-    # return type depends on the number of groups in the pattern
+    # return type is either list[str/bytes] or list[tuple[str/bytes, ...]]
     @overload
     def findall(self: Pattern[str], string: str, pos: int = 0, endpos: int = sys.maxsize) -> list[Any]: ...
     @overload
@@ -302,6 +302,7 @@ def split(
     pattern: bytes | Pattern[bytes], string: ReadableBuffer, maxsplit: int = 0, flags: _FlagsType = 0
 ) -> list[bytes | MaybeNone]: ...
 
+# return type is either list[str/bytes] or list[tuple[str/bytes, ...]]
 @overload
 def findall(pattern: str | Pattern[str], string: str, flags: _FlagsType = 0) -> list[Any]: ...
 @overload