Docs: Fix typo in socketserver documentation (python#140956)

Author: thomasballarddev

Doc/library/socketserver.rst

@@ -546,7 +546,7 @@ The difference is that the ``readline()`` call in the second handler will call
 first handler had to use a ``recv()`` loop to accumulate data until a
 newline itself.  If it had just used a single ``recv()`` without the loop it
 would just have returned what has been received so far from the client.
-TCP is stream based: data arrives in the order it was sent, but there no
+TCP is stream based: data arrives in the order it was sent, but there is no
 correlation between client ``send()`` or ``sendall()`` calls and the number
 of ``recv()`` calls on the server required to receive it.