sslutil: fix comment to use inclusive or instead of exclusive or

The incorrect "either" was introduced by one of my recent patches.

mercurial/sslutil.py

@@ -100,8 +100,8 b' def _hostsettings(ui, hostname):'
     # BEAST and POODLE). We allow users to downgrade to TLS 1.0+ via config
     # options in case a legacy server is encountered.
 
-    # setup.py checks that either TLS 1.1 or TLS 1.2 is present, so the
-    # following assert should not fail.
+    # setup.py checks that TLS 1.1 or TLS 1.2 is present, so the following
+    # assert should not fail.
     assert supportedprotocols - {b'tls1.0'}
     defaultminimumprotocol = b'tls1.1'