fix CharacteristicBuffer.readinto

Author: elpekenin

shared-bindings/_bleio/CharacteristicBuffer.c

@@ -80,9 +80,11 @@ static void check_for_deinit(bleio_characteristic_buffer_obj_t *self) {
 //|         :rtype: bytes or None"""
 //|         ...
 //|
-//|     def readinto(self, buf: WriteableBuffer) -> Optional[int]:
+//|     def readinto(self, buf: WriteableBuffer, nbytes: Optional[int] = None) -> Optional[int]:
 //|         """Read bytes into the ``buf``. Read at most ``len(buf)`` bytes.
 //|
+//|          You may reduce this maximum read using the ``n_bytes`` argument.
+//|
 //|         :return: number of bytes read and stored into ``buf``
 //|         :rtype: int or None (on a non-blocking error)"""
 //|         ...