Import upstream CPython branch '3.14'

Summary:
Python `3.14.0rc2+` (`3.14`) was **published** on 2025-08-23 16:27:51+00:00.

# Commit Info

Base: (`3.14.0rc2+`) - `d619015ecd1c57bde9babc8defaf4c9f8f583be1` (commit date: 2025-08-22 14:27:49+00:00)
Imported: (`3.14.0rc2+`) - `3.14` (commit date: 2025-08-23 16:27:51+00:00)

Reviewed By: itamaro

Differential Revision: D80898340

fbshipit-source-id: fce5c1171b22839a9e1935c17ccb57f621e7c548

Author: generatedunixname1734921407115435

Doc/library/asyncio-stream.rst

@@ -321,6 +321,9 @@ StreamWriter
          stream.write(data)
          await stream.drain()
 
+      .. note::
+         The *data* buffer should be a C contiguous one-dimensional :term:`bytes-like object <bytes-like object>`.
+
    .. method:: writelines(data)
 
       The method writes a list (or any iterable) of bytes to the underlying socket