[3.13] [docs] fix grammar in ssl.SSLContect.sslsocket_class docs (GH-137935) (#137951)

[docs] fix grammar in ssl.SSLContect.sslsocket_class docs (GH-137935)

---------
(cherry picked from commit 379161d)

Co-authored-by: PrinceNaroliya <naroliyaprince@gmail.com>
Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>

Author: 3 people

Doc/library/ssl.rst

@@ -1840,8 +1840,9 @@ to speed up repeated connections from the same clients.
 .. attribute:: SSLContext.sslsocket_class
 
    The return type of :meth:`SSLContext.wrap_socket`, defaults to
-   :class:`SSLSocket`. The attribute can be overridden on instance of class
-   in order to return a custom subclass of :class:`SSLSocket`.
+   :class:`SSLSocket`. The attribute can be assigned to on instances of
+   :class:`SSLContext` in order to return a custom subclass of
+   :class:`SSLSocket`.
 
    .. versionadded:: 3.7