Fix delimiter references in comments and update listenInterface documentation

Author: Siomachkin

listeners.go

@@ -170,13 +170,13 @@ func (na NetworkAddress) Listen(ctx context.Context, portOffset uint, config net
 	return na.listen(ctx, portOffset, config)
 }
 
-// listenInterface resolves an interface name to a single IP address and creates a listener
-// based on the specified binding mode (auto, ipv4, ipv6, all).
-// Note: For 'all' mode, this function still returns only the first IP - the expansion
-// to multiple listeners happens at the HTTP Caddyfile parser level.
+// listenInterface resolves an interface name to an IP address and creates a listener.
+// For all binding modes, this function always returns one listener using the first resolved IP.
+// For multi-address modes (ipv4, ipv6, all), the expansion to multiple listeners
+// happens at the HTTP Caddyfile parser level (see addresses.go).
 func (na NetworkAddress) listenInterface(ctx context.Context, portOffset uint, config net.ListenConfig) (any, error) {
 	// Decode interface name and mode from Host field
-	// Format: "interface_name|~|mode"
+	// Format: "interface_name||mode"
 	var ifaceName string
 	mode := InterfaceBindingAuto
 
@@ -283,7 +283,7 @@ func (na NetworkAddress) IsInterfaceNetwork() bool {
 		return false
 	}
 
-	// Handle encoded interface name with mode: "interface_name|~|mode"
+	// Handle encoded interface name with mode: "interface_name||mode"
 	hostToCheck := na.Host
 	if strings.Contains(na.Host, InterfaceDelimiter) {
 		parts := strings.SplitN(na.Host, InterfaceDelimiter, 2)
@@ -1203,7 +1203,7 @@ func parseInterfaceAddress(network, host, port string) (NetworkAddress, error) {
 	}
 
 	// Encode the interface name and mode in the Host field
-	// Format: "interface_name|~|mode" so we can decode it later in listenInterface
+	// Format: "interface_name||mode" so we can decode it later in listenInterface
 	hostWithMode := fmt.Sprintf("%s%s%s", host, InterfaceDelimiter, string(mode))
 
 	return NetworkAddress{