Fix docstring in SSL.py
diff --git a/OpenSSL/SSL.py b/OpenSSL/SSL.py
index 8fefd8f..aaaea87 100644
--- a/OpenSSL/SSL.py
+++ b/OpenSSL/SSL.py
@@ -1888,7 +1888,7 @@
         Obtain the protocol version of the current connection.
 
         :returns: The TLS version of the current connection, for example
-            the value for TLS 1.2 would be 0x303.
+            the value for TLS 1.2 would be ``TLSv1.2``.
         :rtype: :py:class:`unicode`
         """
         version = _ffi.string(_lib.SSL_get_version(self._ssl))