Improve set_servername_callback docstring.
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index e69165b..835355a 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -2503,13 +2503,13 @@
PyDoc_STRVAR(PySSL_set_servername_callback_doc,
"set_servername_callback(method)\n\
-\
+\n\
This sets a callback that will be called when a server name is provided by\n\
the SSL/TLS client in the SNI extension.\n\
-\
+\n\
If the argument is None then the callback is disabled. The method is called\n\
with the SSLSocket, the server name as a string, and the SSLContext object.\n\
-See RFC 6066 for details of the SNI");
+See RFC 6066 for details of the SNI extension.");
static PyObject *
set_servername_callback(PySSLContext *self, PyObject *args)