remove comment about old openssl versions in nginx config

I doubt many people are actually still using OpenSSL 1.0.2 or older,
since that version was first released in 2015, and last updated in 2019.

installation/nginx/akkoma.nginx

@@ -54,8 +54,6 @@ server {
     ssl_protocols TLSv1.2 TLSv1.3;
     ssl_ciphers "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
     ssl_prefer_server_ciphers off;
-    # In case of an old server with an OpenSSL version of 1.0.2 or below,
-    # leave only prime256v1 or comment out the following line.
     ssl_ecdh_curve X25519:prime256v1:secp384r1:secp521r1;
     ssl_stapling on;
     ssl_stapling_verify on;