Point HidlLazyUtils to init documentation.

This class assumes other configurations, so indicating them and further
documentation here.

Bug: 162749088
Test: N/A
Change-Id: Ia08a643bae61233a6ffa1ea8d0d8ccdead783268
diff --git a/transport/include/hidl/HidlLazyUtils.h b/transport/include/hidl/HidlLazyUtils.h
index 257de98..56d3fde 100644
--- a/transport/include/hidl/HidlLazyUtils.h
+++ b/transport/include/hidl/HidlLazyUtils.h
@@ -26,7 +26,16 @@
 class LazyServiceRegistrarImpl;
 }  // namespace details
 
-/** Exits when all HALs registered through this object have 0 clients */
+/**
+ * Exits when all HALs registered through this object have 0 clients
+ *
+ * In order to use this class, it's expected that your service:
+ * - registers all services in the process with this API
+ * - configures services as oneshot + disabled in init .rc files
+ * - uses 'interface' declarations in init .rc files
+ *
+ * For more information on init .rc configuration, see system/core/init/README.md
+ **/
 class LazyServiceRegistrar {
    public:
      LazyServiceRegistrar();