[docs] Correct typos in SSLContext.sni_callback (GH-30623) (GH-31421)

Co-authored-by: Jörn Heissler <[email protected]>
(cherry picked from commit f80a97b)

Co-authored-by: Jörn Heissler <[email protected]>

Author: miss-islington

Doc/library/ssl.rst

@@ -1753,10 +1753,10 @@ to speed up repeated connections from the same clients.
    Due to the early negotiation phase of the TLS connection, only limited
    methods and attributes are usable like
    :meth:`SSLSocket.selected_alpn_protocol` and :attr:`SSLSocket.context`.
-   :meth:`SSLSocket.getpeercert`, :meth:`SSLSocket.getpeercert`,
-   :meth:`SSLSocket.cipher` and :meth:`SSLSocket.compress` methods require that
+   The :meth:`SSLSocket.getpeercert`,
+   :meth:`SSLSocket.cipher` and :meth:`SSLSocket.compression` methods require that
    the TLS connection has progressed beyond the TLS Client Hello and therefore
-   will not contain return meaningful values nor can they be called safely.
+   will not return meaningful values nor can they be called safely.
 
    The *sni_callback* function must return ``None`` to allow the
    TLS negotiation to continue.  If a TLS failure is required, a constant