Correct insecure port list

Author: dwfreed

_includes/hero.html

@@ -51,7 +51,7 @@ <h1 class="pt-4">OFTC</h1>
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 						<p><i role="presentation" class='bi bi-unlock-fill' title="Connect over plain text"></i>
-								<strong>(Not recommended)</strong> To connect without TLS/SSL use ports 6668-6670 or 7000.</p>
+								<strong>(Not recommended)</strong> To connect without TLS/SSL use ports 6667-6670 or 7000.</p>
 						<p>IRC services (NickServ, ChanServ) are available for nick and channel registration. See <a href="NickServ/CertFP/">CertFP</a> for how to configure client certificate-based NickServ identification.</p>
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