chore: Added SMTP_TLS and SMTP_SSL in .env.example

Added SMTP_TLS and SMTP_SSL in .env.example

Fixes #3396

.env.example

@@ -57,6 +57,9 @@ SMTP_AUTHENTICATION=
 SMTP_ENABLE_STARTTLS_AUTO=true
 # Can be: 'none', 'peer', 'client_once', 'fail_if_no_peer_cert', see http://api.rubyonrails.org/classes/ActionMailer/Base.html
 SMTP_OPENSSL_VERIFY_MODE=peer
+# Comment out the following environment variables if required by your SMTP server
+# SMTP_TLS=
+# SMTP_SSL=
 
 # Mail Incoming
 # This is the domain set for the reply emails when conversation continuity is enabled