roles/nginx: Format and add comments to nginx https config

Signed-off-by: Alan Orth <alan.orth@gmail.com>

roles/nginx/templates/https.j2

@@ -6,8 +6,9 @@
     ssl_certificate_key {{ tls_key_dir }}/{{ domain_name }}.crt.pem;
 
     ssl_session_timeout 5m;
-    ssl_session_cache shared:SSL:1m;
+    ssl_session_cache shared:SSL:1m;    # 1MB -> 4,000 sessions
     ssl_buffer_size 1400;               # 1400 bytes to fit in one MTU
+
     ssl_dhparam /etc/ssl/certs/dhparam.pem;
     ssl_protocols {{ nginx_tls_protocols }};
     ssl_ciphers "{{ tls_cipher_suite }}";