gh-84747: Add `async for` comment for StreamReader (GH-98633)

(cherry picked from commit 4196ee5c8b489f457874759ee22c9237e08f85c4)

Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>

diff --git a/Doc/library/asyncio-stream.rst b/Doc/library/asyncio-stream.rst
index 19210a556057f2f2a89a0c04454ae2f7b189061a..bed10a40fb7e6b041e14a9e15d7be01afb648c26 100644 (file)
--- a/Doc/library/asyncio-stream.rst
+++ b/Doc/library/asyncio-stream.rst
@@ -183,7 +183,8 @@ StreamReader
 .. class:: StreamReader
 
    Represents a reader object that provides APIs to read data
-   from the IO stream.
+   from the IO stream. As an :term:`asynchronous iterable`, the
+   object supports the :keyword:`async for` statement.
 
    It is not recommended to instantiate *StreamReader* objects
    directly; use :func:`open_connection` and :func:`start_server`