bpo-39616: clarify SSLContext.check_hostname effect (GH-18484)



It doesn't actually affect whether match_hostname() is called (it
never is in this context any longer), but whether hostname
verification occurs in the first place.
diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
index 1adac84..c0789ee 100644
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@ -1885,7 +1885,7 @@
 
 .. attribute:: SSLContext.check_hostname
 
-   Whether to match the peer cert's hostname with :func:`match_hostname` in
+   Whether to match the peer cert's hostname in
    :meth:`SSLSocket.do_handshake`. The context's
    :attr:`~SSLContext.verify_mode` must be set to :data:`CERT_OPTIONAL` or
    :data:`CERT_REQUIRED`, and you must pass *server_hostname* to