fix: update env template for systemd compatibility

Adjust env template to ensure compatibility with systemd's EnvironmentFile parsing, which only recognizes line-starting comment symbols.

.env.template

@@ -477,8 +477,10 @@
 # SMTP_HOST=smtp.domain.tld
 # SMTP_FROM=vaultwarden@domain.tld
 # SMTP_FROM_NAME=Vaultwarden
-# SMTP_SECURITY=starttls # ("starttls", "force_tls", "off") Enable a secure connection. Default is "starttls" (Explicit - ports 587 or 25), "force_tls" (Implicit - port 465) or "off", no encryption (port 25)
-# SMTP_PORT=587          # Ports 587 (submission) and 25 (smtp) are standard without encryption and with encryption via STARTTLS (Explicit TLS). Port 465 (submissions) is used for encrypted submission (Implicit TLS).
+## ("starttls", "force_tls", "off") Enable a secure connection. Default is "starttls" (Explicit - ports 587 or 25), "force_tls" (Implicit - port 465) or "off", no encryption (port 25)
+# SMTP_SECURITY=starttls
+## Ports 587 (submission) and 25 (smtp) are standard without encryption and with encryption via STARTTLS (Explicit TLS). Port 465 (submissions) is used for encrypted submission (Implicit TLS).
+# SMTP_PORT=587
 # SMTP_USERNAME=username
 # SMTP_PASSWORD=password
 # SMTP_TIMEOUT=15
@@ -524,7 +526,8 @@
 ## Rocket specific settings
 ## See https://rocket.rs/v0.5/guide/configuration/ for more details.
 # ROCKET_ADDRESS=0.0.0.0
-# ROCKET_PORT=80  # Defaults to 80 in the Docker images, or 8000 otherwise.
+## Defaults to 80 in the Docker images, or 8000 otherwise.
+# ROCKET_PORT=80
 # ROCKET_TLS={certs="/path/to/certs.pem",key="/path/to/key.pem"}