gh-150952: Fix incorrect sock_sendto docstring

Author: deadlovelll

Lib/asyncio/selector_events.py

@@ -584,13 +584,10 @@ def _sock_sendall(self, fut, sock, view, pos):
             pos[0] = start
 
     async def sock_sendto(self, sock, data, address):
-        """Send data to the socket.
+        """Send a datagram from sock to address.
 
-        The socket must be connected to a remote socket. This method continues
-        to send data from data until either all data has been sent or an
-        error occurs. None is returned on success. On error, an exception is
-        raised, and there is no way to determine how much data, if any, was
-        successfully processed by the receiving end of the connection.
+        The socket does not have to be connected. This method sends the
+        whole datagram in a single call. Return the number of bytes sent.
         """
         base_events._check_ssl_socket(sock)
         if self._debug and sock.gettimeout() != 0:

Misc/NEWS.d/next/Library/2026-06-05-13-32-27.gh-issue-150952.kRUV5W.rst

@@ -0,0 +1,3 @@
+Fix the docstring of :meth:`asyncio.loop.sock_sendto`, which was mistakenly
+copied from :meth:`asyncio.loop.sock_sendall` and described stream semantics
+instead of a datagram send.