chore: sync the doc comment

Author: vmihailenco

options.go

@@ -110,7 +110,7 @@ type Options struct {
 	// Expired connections may be closed lazily before reuse.
 	// If d <= 0, connections are not closed due to a connection's idle time.
 	//
-	// Default is 5 minutes. -1 disables idle timeout check.
+	// Default is 30 minutes. -1 disables idle timeout check.
 	ConnMaxIdleTime time.Duration
 	// ConnMaxLifetime is the maximum amount of time a connection may be reused.
 	//