uio: Update style.

Also fix compatibility information.

doc/main/micropython/uio.rst

@@ -1,6 +1,6 @@
+.. pybricks-requirements:: stm32-extra
+
 :mod:`uio` -- Input/output streams
 ==================================
 
-.. note:: This module is not available on the BOOST Move Hub.
-
 .. automodule:: uio

src/uio/__init__.py

@@ -1,18 +1,17 @@
 # SPDX-License-Identifier: MIT
-# Copyright (c) 2021 The Pybricks Authors
+# Copyright (c) 2022 The Pybricks Authors
 #
 # Portions of documentation copied from:
 # https://raw.githubusercontent.com/micropython/micropython/1e6d18c915ccea0b6a19ffec9710d33dd7e5f866/docs/library/uio.rst
 # Copyright (c) 2014-2021, Damien P. George, Paul Sokolovsky, and contributors
 
 """
-This module contains additional types of ``stream`` (file-like) objects
-and helper functions.
+This module contains ``stream`` objects that behave like files.
 """
 
 # TODO: open() is not implemented on Powered Up hubs
 
-from typing import overload
+from typing import overload, Union
 
 # TODO: MicroPython streams implement '__enter__', '__exit__', 'close', 'read',
 # 'readinto', 'readline', 'write', 'flush', 'getvalue', 'seek', 'tell'
@@ -25,7 +24,7 @@ class BytesIO:
         ...
 
     @overload
-    def __init__(self, initial_bytes: bytes) -> None:
+    def __init__(self, data: Union[bytes, bytearray]) -> None:
         ...
 
     @overload
@@ -34,11 +33,16 @@ class BytesIO:
 
     def __init__(self, *args) -> None:
         """
+        BytesIO(​)
+        BytesIO(data)
+        BytesIO(alloc_size)
+
         A binary stream using an in-memory bytes buffer.
 
-        Args:
-            initial_bytes: Optional bytes-like object that contains initial data.
-            alloc_size: Optional number of preallocated bytes.
+        Arguments:
+            data (bytes or bytearray): Optional bytes-like object
+                that contains initial data.
+            alloc_size (int): Optional number of preallocated bytes.
         """
 
 
@@ -48,7 +52,7 @@ class StringIO:
         ...
 
     @overload
-    def __init__(self, initial_value: str) -> None:
+    def __init__(self, string: str) -> None:
         ...
 
     @overload
@@ -57,16 +61,20 @@ class StringIO:
 
     def __init__(self, *args) -> None:
         """
-        A binary stream using an in-memory string buffer.
+        StringIO(​)
+        StringIO(string)
+        StringIO(alloc_size)
 
-        Args:
-            initial_value: Optional string object that contains initial data.
-            alloc_size: Optional number of preallocated bytes.
+        A stream using an in-memory string buffer.
+
+        Arguments:
+            string (str): Optional string with initial data.
+            alloc_size (int): Optional number of preallocated bytes.
         """
 
 
 class FileIO:
     """
-    This is type of a file open in binary mode, e.g. using ``open(name, 'rb')``.
+    This type represents a file opened in binary mode with ``open(name, 'rb')``.
     You should not instantiate this class directly.
     """